diff --git a/public/app/features/alerting/unified/AmRoutes.test.tsx b/public/app/features/alerting/unified/AmRoutes.test.tsx
index c4a30208147..b70549af1b9 100644
--- a/public/app/features/alerting/unified/AmRoutes.test.tsx
+++ b/public/app/features/alerting/unified/AmRoutes.test.tsx
@@ -302,9 +302,9 @@ describe('AmRoutes', () => {
     // configure timing intervals
     await userEvent.click(byText('Timing options').get(rootRouteContainer));
 
-    await updateTiming(ui.groupWaitContainer.get(), '1', 'Minutes');
-    await updateTiming(ui.groupIntervalContainer.get(), '4', 'Minutes');
-    await updateTiming(ui.groupRepeatContainer.get(), '5', 'Hours');
+    await updateTiming(ui.groupWaitContainer.get(), '1m');
+    await updateTiming(ui.groupIntervalContainer.get(), '4m');
+    await updateTiming(ui.groupRepeatContainer.get(), '5h');
 
     //save
     await userEvent.click(ui.saveButton.get(rootRouteContainer));
@@ -728,11 +728,9 @@ const clickSelectOption = async (selectElement: HTMLElement, optionText: string)
   await selectOptionInTest(selectElement, optionText);
 };
 
-const updateTiming = async (selectElement: HTMLElement, value: string, timeUnit: string): Promise<void> => {
-  const input = byRole('textbox').get(selectElement);
-  const select = byRole('combobox').get(selectElement);
+const updateTiming = async (timingInputContainer: HTMLElement, value: string): Promise<void> => {
+  const input = byRole('textbox').get(timingInputContainer);
+
   await userEvent.clear(input);
   await userEvent.type(input, value);
-  await userEvent.click(select);
-  await selectOptionInTest(selectElement, timeUnit);
 };
diff --git a/public/app/features/alerting/unified/components/amroutes/AmRootRouteForm.test.tsx b/public/app/features/alerting/unified/components/amroutes/AmRootRouteForm.test.tsx
new file mode 100644
index 00000000000..22c93550371
--- /dev/null
+++ b/public/app/features/alerting/unified/components/amroutes/AmRootRouteForm.test.tsx
@@ -0,0 +1,137 @@
+import { render } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { noop } from 'lodash';
+import React from 'react';
+import { Provider } from 'react-redux';
+import { MemoryRouter } from 'react-router-dom';
+import { byRole } from 'testing-library-selector';
+
+import { Route } from 'app/plugins/datasource/alertmanager/types';
+import { configureStore } from 'app/store/configureStore';
+
+import * as grafanaApp from '../../components/receivers/grafanaAppReceivers/grafanaApp';
+import { FormAmRoute } from '../../types/amroutes';
+import { amRouteToFormAmRoute } from '../../utils/amroutes';
+import { GRAFANA_RULES_SOURCE_NAME } from '../../utils/datasource';
+import { AmRouteReceiver } from '../receivers/grafanaAppReceivers/types';
+
+import { AmRootRouteForm } from './AmRootRouteForm';
+
+const ui = {
+  error: byRole('alert'),
+  timingOptionsBtn: byRole('button', { name: /Timing options/ }),
+  submitBtn: byRole('button', { name: /Save/ }),
+  groupWaitInput: byRole('textbox', { name: /Group wait/ }),
+  groupIntervalInput: byRole('textbox', { name: /Group interval/ }),
+  repeatIntervalInput: byRole('textbox', { name: /Repeat interval/ }),
+};
+
+const useGetGrafanaReceiverTypeCheckerMock = jest.spyOn(grafanaApp, 'useGetGrafanaReceiverTypeChecker');
+useGetGrafanaReceiverTypeCheckerMock.mockReturnValue(() => undefined);
+
+// TODO Default and Notification policy form should be unified so we don't need to maintain two almost identical forms
+describe('AmRootRouteForm', function () {
+  describe('Timing options', function () {
+    it('should render prometheus duration strings in form inputs', async function () {
+      const user = userEvent.setup();
+
+      renderRouteForm({
+        group_wait: '1m30s',
+        group_interval: '2d4h30m35s',
+        repeat_interval: '1w2d6h',
+      });
+
+      await user.click(ui.timingOptionsBtn.get());
+      expect(ui.groupWaitInput.get()).toHaveValue('1m30s');
+      expect(ui.groupIntervalInput.get()).toHaveValue('2d4h30m35s');
+      expect(ui.repeatIntervalInput.get()).toHaveValue('1w2d6h');
+    });
+    it('should allow submitting valid prometheus duration strings', async function () {
+      const user = userEvent.setup();
+
+      const onSubmit = jest.fn();
+      renderRouteForm(
+        {
+          receiver: 'default',
+        },
+        [{ value: 'default', label: 'Default' }],
+        onSubmit
+      );
+
+      await user.click(ui.timingOptionsBtn.get());
+
+      await user.type(ui.groupWaitInput.get(), '5m25s');
+      await user.type(ui.groupIntervalInput.get(), '35m40s');
+      await user.type(ui.repeatIntervalInput.get(), '4h30m');
+
+      await user.click(ui.submitBtn.get());
+
+      expect(ui.error.queryAll()).toHaveLength(0);
+      expect(onSubmit).toHaveBeenCalledWith(
+        expect.objectContaining<Partial<FormAmRoute>>({
+          groupWaitValue: '5m25s',
+          groupIntervalValue: '35m40s',
+          repeatIntervalValue: '4h30m',
+        }),
+        expect.anything()
+      );
+    });
+  });
+
+  it('should allow resetting existing timing options', async function () {
+    const user = userEvent.setup();
+
+    const onSubmit = jest.fn();
+    renderRouteForm(
+      {
+        receiver: 'default',
+        group_wait: '1m30s',
+        group_interval: '2d4h30m35s',
+        repeat_interval: '1w2d6h',
+      },
+      [{ value: 'default', label: 'Default' }],
+      onSubmit
+    );
+
+    await user.click(ui.timingOptionsBtn.get());
+    await user.clear(ui.groupWaitInput.get());
+    await user.clear(ui.groupIntervalInput.get());
+    await user.clear(ui.repeatIntervalInput.get());
+
+    await user.click(ui.submitBtn.get());
+
+    expect(ui.error.queryAll()).toHaveLength(0);
+    expect(onSubmit).toHaveBeenCalledWith(
+      expect.objectContaining<Partial<FormAmRoute>>({
+        groupWaitValue: '',
+        groupIntervalValue: '',
+        repeatIntervalValue: '',
+      }),
+      expect.anything()
+    );
+  });
+});
+
+function renderRouteForm(
+  route: Route,
+  receivers: AmRouteReceiver[] = [],
+  onSubmit: (route: Partial<FormAmRoute>) => void = noop
+) {
+  const Wrapper = ({ children }: { children: React.ReactNode }) => (
+    <Provider store={configureStore()}>
+      <MemoryRouter>{children}</MemoryRouter>
+    </Provider>
+  );
+  const [formAmRoute] = amRouteToFormAmRoute(route);
+
+  render(
+    <AmRootRouteForm
+      alertManagerSourceName={GRAFANA_RULES_SOURCE_NAME}
+      onSave={onSubmit}
+      receivers={receivers}
+      routes={formAmRoute}
+      onCancel={noop}
+    />,
+    { wrapper: Wrapper }
+  );
+}
diff --git a/public/app/features/alerting/unified/components/amroutes/AmRootRouteForm.tsx b/public/app/features/alerting/unified/components/amroutes/AmRootRouteForm.tsx
index 6768061c0cb..ecc840b5886 100644
--- a/public/app/features/alerting/unified/components/amroutes/AmRootRouteForm.tsx
+++ b/public/app/features/alerting/unified/components/amroutes/AmRootRouteForm.tsx
@@ -1,22 +1,22 @@
-import { cx } from '@emotion/css';
 import React, { FC, useState } from 'react';
 
-import { Button, Collapse, Field, Form, Input, InputControl, Link, MultiSelect, Select, useStyles2 } from '@grafana/ui';
+import { Button, Collapse, Field, Form, InputControl, Link, MultiSelect, Select, useStyles2 } from '@grafana/ui';
 
 import { FormAmRoute } from '../../types/amroutes';
 import {
+  commonGroupByOptions,
   mapMultiSelectValueToStrings,
   mapSelectValueToString,
-  optionalPositiveInteger,
-  stringToSelectableValue,
+  promDurationValidator,
   stringsToSelectableValues,
-  commonGroupByOptions,
+  stringToSelectableValue,
 } from '../../utils/amroutes';
 import { makeAMLink } from '../../utils/misc';
-import { timeOptions } from '../../utils/time';
 import { AmRouteReceiver } from '../receivers/grafanaAppReceivers/types';
 
+import { PromDurationInput } from './PromDurationInput';
 import { getFormStyles } from './formStyles';
+import { TIMING_OPTIONS_DEFAULTS } from './timingOptions';
 
 export interface AmRootRouteFormProps {
   alertManagerSourceName: string;
@@ -39,7 +39,7 @@ export const AmRootRouteForm: FC<AmRootRouteFormProps> = ({
 
   return (
     <Form defaultValues={{ ...routes, overrideTimings: true, overrideGrouping: true }} onSubmit={onSave}>
-      {({ control, errors, setValue }) => (
+      {({ register, control, errors, setValue }) => (
         <>
           <Field label="Default contact point" invalid={!!errors.receiver} error={errors.receiver?.message}>
             <>
@@ -102,112 +102,50 @@ export const AmRootRouteForm: FC<AmRootRouteFormProps> = ({
             label="Timing options"
             onToggle={setIsTimingOptionsExpanded}
           >
-            <Field
-              label="Group wait"
-              description="The waiting time until the initial notification is sent for a new group created by an incoming alert. Default 30 seconds."
-              invalid={!!errors.groupWaitValue}
-              error={errors.groupWaitValue?.message}
-              data-testid="am-group-wait"
-            >
-              <>
-                <div className={cx(styles.container, styles.timingContainer)}>
-                  <InputControl
-                    render={({ field, fieldState: { invalid } }) => (
-                      <Input {...field} className={styles.smallInput} invalid={invalid} placeholder={'30'} />
-                    )}
-                    control={control}
-                    name="groupWaitValue"
-                    rules={{
-                      validate: optionalPositiveInteger,
-                    }}
-                  />
-                  <InputControl
-                    render={({ field: { onChange, ref, ...field } }) => (
-                      <Select
-                        {...field}
-                        className={styles.input}
-                        onChange={(value) => onChange(mapSelectValueToString(value))}
-                        options={timeOptions}
-                        aria-label="Group wait type"
-                      />
-                    )}
-                    control={control}
-                    name="groupWaitValueType"
-                  />
-                </div>
-              </>
-            </Field>
-            <Field
-              label="Group interval"
-              description="The waiting time to send a batch of new alerts for that group after the first notification was sent. Default 5 minutes."
-              invalid={!!errors.groupIntervalValue}
-              error={errors.groupIntervalValue?.message}
-              data-testid="am-group-interval"
-            >
-              <>
-                <div className={cx(styles.container, styles.timingContainer)}>
-                  <InputControl
-                    render={({ field, fieldState: { invalid } }) => (
-                      <Input {...field} className={styles.smallInput} invalid={invalid} placeholder={'5'} />
-                    )}
-                    control={control}
-                    name="groupIntervalValue"
-                    rules={{
-                      validate: optionalPositiveInteger,
-                    }}
-                  />
-                  <InputControl
-                    render={({ field: { onChange, ref, ...field } }) => (
-                      <Select
-                        {...field}
-                        className={styles.input}
-                        onChange={(value) => onChange(mapSelectValueToString(value))}
-                        options={timeOptions}
-                        aria-label="Group interval type"
-                      />
-                    )}
-                    control={control}
-                    name="groupIntervalValueType"
-                  />
-                </div>
-              </>
-            </Field>
-            <Field
-              label="Repeat interval"
-              description="The waiting time to resend an alert after they have successfully been sent. Default 4 hours."
-              invalid={!!errors.repeatIntervalValue}
-              error={errors.repeatIntervalValue?.message}
-              data-testid="am-repeat-interval"
-            >
-              <>
-                <div className={cx(styles.container, styles.timingContainer)}>
-                  <InputControl
-                    render={({ field, fieldState: { invalid } }) => (
-                      <Input {...field} className={styles.smallInput} invalid={invalid} placeholder="4" />
-                    )}
-                    control={control}
-                    name="repeatIntervalValue"
-                    rules={{
-                      validate: optionalPositiveInteger,
-                    }}
-                  />
-                  <InputControl
-                    render={({ field: { onChange, ref, ...field } }) => (
-                      <Select
-                        {...field}
-                        className={styles.input}
-                        menuPlacement="top"
-                        onChange={(value) => onChange(mapSelectValueToString(value))}
-                        options={timeOptions}
-                        aria-label="Repeat interval type"
-                      />
-                    )}
-                    control={control}
-                    name="repeatIntervalValueType"
-                  />
-                </div>
-              </>
-            </Field>
+            <div className={styles.timingFormContainer}>
+              <Field
+                label="Group wait"
+                description="The waiting time until the initial notification is sent for a new group created by an incoming alert. Default 30 seconds."
+                invalid={!!errors.groupWaitValue}
+                error={errors.groupWaitValue?.message}
+                data-testid="am-group-wait"
+              >
+                <PromDurationInput
+                  {...register('groupWaitValue', { validate: promDurationValidator })}
+                  placeholder={TIMING_OPTIONS_DEFAULTS.group_wait}
+                  className={styles.promDurationInput}
+                  aria-label="Group wait"
+                />
+              </Field>
+              <Field
+                label="Group interval"
+                description="The waiting time to send a batch of new alerts for that group after the first notification was sent. Default 5 minutes."
+                invalid={!!errors.groupIntervalValue}
+                error={errors.groupIntervalValue?.message}
+                data-testid="am-group-interval"
+              >
+                <PromDurationInput
+                  {...register('groupIntervalValue', { validate: promDurationValidator })}
+                  placeholder={TIMING_OPTIONS_DEFAULTS.group_interval}
+                  className={styles.promDurationInput}
+                  aria-label="Group interval"
+                />
+              </Field>
+              <Field
+                label="Repeat interval"
+                description="The waiting time to resend an alert after they have successfully been sent. Default 4 hours."
+                invalid={!!errors.repeatIntervalValue}
+                error={errors.repeatIntervalValue?.message}
+                data-testid="am-repeat-interval"
+              >
+                <PromDurationInput
+                  {...register('repeatIntervalValue', { validate: promDurationValidator })}
+                  placeholder={TIMING_OPTIONS_DEFAULTS.repeat_interval}
+                  className={styles.promDurationInput}
+                  aria-label="Repeat interval"
+                />
+              </Field>
+            </div>
           </Collapse>
           <div className={styles.container}>
             <Button type="submit">Save</Button>
diff --git a/public/app/features/alerting/unified/components/amroutes/AmRootRouteRead.tsx b/public/app/features/alerting/unified/components/amroutes/AmRootRouteRead.tsx
index 026e7c6f289..28b4ff950f9 100644
--- a/public/app/features/alerting/unified/components/amroutes/AmRootRouteRead.tsx
+++ b/public/app/features/alerting/unified/components/amroutes/AmRootRouteRead.tsx
@@ -15,13 +15,9 @@ export const AmRootRouteRead: FC<AmRootRouteReadProps> = ({ routes }) => {
 
   const receiver = routes.receiver || '-';
   const groupBy = routes.groupBy.join(', ') || '-';
-  const groupWait = routes.groupWaitValue ? `${routes.groupWaitValue}${routes.groupWaitValueType}` : '-';
-  const groupInterval = routes.groupIntervalValue
-    ? `${routes.groupIntervalValue}${routes.groupIntervalValueType}`
-    : '-';
-  const repeatInterval = routes.repeatIntervalValue
-    ? `${routes.repeatIntervalValue}${routes.repeatIntervalValueType}`
-    : '-';
+  const groupWait = routes.groupWaitValue || '-';
+  const groupInterval = routes.groupIntervalValue || '-';
+  const repeatInterval = routes.repeatIntervalValue || '-';
 
   return (
     <div className={styles.container}>
diff --git a/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedForm.test.tsx b/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedForm.test.tsx
new file mode 100644
index 00000000000..abcc7edac47
--- /dev/null
+++ b/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedForm.test.tsx
@@ -0,0 +1,127 @@
+import { render } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { noop } from 'lodash';
+import React from 'react';
+import { Provider } from 'react-redux';
+import { MemoryRouter } from 'react-router-dom';
+import { byRole } from 'testing-library-selector';
+
+import { Route } from 'app/plugins/datasource/alertmanager/types';
+import { configureStore } from 'app/store/configureStore';
+
+import * as grafanaApp from '../../components/receivers/grafanaAppReceivers/grafanaApp';
+import { FormAmRoute } from '../../types/amroutes';
+import { amRouteToFormAmRoute } from '../../utils/amroutes';
+import { AmRouteReceiver } from '../receivers/grafanaAppReceivers/types';
+
+import { AmRoutesExpandedForm } from './AmRoutesExpandedForm';
+
+const ui = {
+  error: byRole('alert'),
+  overrideTimingsCheckbox: byRole('checkbox', { name: /Override general timings/ }),
+  submitBtn: byRole('button', { name: /Save policy/ }),
+  groupWaitInput: byRole('textbox', { name: /Group wait/ }),
+  groupIntervalInput: byRole('textbox', { name: /Group interval/ }),
+  repeatIntervalInput: byRole('textbox', { name: /Repeat interval/ }),
+};
+
+const useGetGrafanaReceiverTypeCheckerMock = jest.spyOn(grafanaApp, 'useGetGrafanaReceiverTypeChecker');
+useGetGrafanaReceiverTypeCheckerMock.mockReturnValue(() => undefined);
+
+// TODO Default and Notification policy form should be unified so we don't need to maintain two almost identical forms
+describe('AmRoutesExpandedForm', function () {
+  describe('Timing options', function () {
+    it('should render prometheus duration strings in form inputs', async function () {
+      renderRouteForm({
+        group_wait: '1m30s',
+        group_interval: '2d4h30m35s',
+        repeat_interval: '1w2d6h',
+      });
+
+      expect(ui.overrideTimingsCheckbox.get()).toBeChecked();
+      expect(ui.groupWaitInput.get()).toHaveValue('1m30s');
+      expect(ui.groupIntervalInput.get()).toHaveValue('2d4h30m35s');
+      expect(ui.repeatIntervalInput.get()).toHaveValue('1w2d6h');
+    });
+
+    it('should allow submitting valid prometheus duration strings', async function () {
+      const user = userEvent.setup();
+
+      const onSubmit = jest.fn();
+      renderRouteForm(
+        {
+          receiver: 'default',
+        },
+        [{ value: 'default', label: 'Default' }],
+        onSubmit
+      );
+
+      await user.click(ui.overrideTimingsCheckbox.get());
+
+      await user.type(ui.groupWaitInput.get(), '5m25s');
+      await user.type(ui.groupIntervalInput.get(), '35m40s');
+      await user.type(ui.repeatIntervalInput.get(), '4h30m');
+
+      await user.click(ui.submitBtn.get());
+
+      expect(ui.error.queryAll()).toHaveLength(0);
+      expect(onSubmit).toHaveBeenCalledWith(
+        expect.objectContaining<Partial<FormAmRoute>>({
+          groupWaitValue: '5m25s',
+          groupIntervalValue: '35m40s',
+          repeatIntervalValue: '4h30m',
+        }),
+        expect.anything()
+      );
+    });
+  });
+
+  it('should allow resetting existing timing options', async function () {
+    const user = userEvent.setup();
+
+    const onSubmit = jest.fn();
+    renderRouteForm(
+      {
+        receiver: 'default',
+        group_wait: '1m30s',
+        group_interval: '2d4h30m35s',
+        repeat_interval: '1w2d6h',
+      },
+      [{ value: 'default', label: 'Default' }],
+      onSubmit
+    );
+
+    await user.clear(ui.groupWaitInput.get());
+    await user.clear(ui.groupIntervalInput.get());
+    await user.clear(ui.repeatIntervalInput.get());
+
+    await user.click(ui.submitBtn.get());
+
+    expect(ui.error.queryAll()).toHaveLength(0);
+    expect(onSubmit).toHaveBeenCalledWith(
+      expect.objectContaining<Partial<FormAmRoute>>({
+        groupWaitValue: '',
+        groupIntervalValue: '',
+        repeatIntervalValue: '',
+      }),
+      expect.anything()
+    );
+  });
+});
+
+function renderRouteForm(
+  route: Route,
+  receivers: AmRouteReceiver[] = [],
+  onSubmit: (route: Partial<FormAmRoute>) => void = noop
+) {
+  const Wrapper = ({ children }: { children: React.ReactNode }) => (
+    <Provider store={configureStore()}>
+      <MemoryRouter>{children}</MemoryRouter>
+    </Provider>
+  );
+  const [formAmRoute] = amRouteToFormAmRoute(route);
+
+  render(<AmRoutesExpandedForm receivers={receivers} routes={formAmRoute} onSave={onSubmit} onCancel={noop} />, {
+    wrapper: Wrapper,
+  });
+}
diff --git a/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedForm.tsx b/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedForm.tsx
index f29b387c8cb..74ccd9c8726 100644
--- a/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedForm.tsx
+++ b/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedForm.tsx
@@ -1,4 +1,4 @@
-import { css, cx } from '@emotion/css';
+import { css } from '@emotion/css';
 import React, { FC, useState } from 'react';
 
 import { GrafanaTheme2 } from '@grafana/data';
@@ -27,14 +27,14 @@ import {
   emptyArrayFieldMatcher,
   mapMultiSelectValueToStrings,
   mapSelectValueToString,
-  optionalPositiveInteger,
   stringToSelectableValue,
   stringsToSelectableValues,
   commonGroupByOptions,
+  promDurationValidator,
 } from '../../utils/amroutes';
-import { timeOptions } from '../../utils/time';
 import { AmRouteReceiver } from '../receivers/grafanaAppReceivers/types';
 
+import { PromDurationInput } from './PromDurationInput';
 import { getFormStyles } from './formStyles';
 
 export interface AmRoutesExpandedFormProps {
@@ -81,7 +81,6 @@ export const AmRoutesExpandedForm: FC<AmRoutesExpandedFormProps> = ({ onCancel,
                   {fields.length > 0 && (
                     <div className={styles.matchersContainer}>
                       {fields.map((field, index) => {
-                        const localPath = `object_matchers[${index}]`;
                         return (
                           <HorizontalGroup key={field.id} align="flex-start" height="auto">
                             <Field
@@ -90,7 +89,7 @@ export const AmRoutesExpandedForm: FC<AmRoutesExpandedFormProps> = ({ onCancel,
                               error={errors.object_matchers?.[index]?.name?.message}
                             >
                               <Input
-                                {...register(`${localPath}.name`, { required: 'Field is required' })}
+                                {...register(`object_matchers.${index}.name`, { required: 'Field is required' })}
                                 defaultValue={field.name}
                                 placeholder="label"
                               />
@@ -108,7 +107,7 @@ export const AmRoutesExpandedForm: FC<AmRoutesExpandedFormProps> = ({ onCancel,
                                 )}
                                 defaultValue={field.operator}
                                 control={control}
-                                name={`${localPath}.operator` as const}
+                                name={`object_matchers.${index}.operator`}
                                 rules={{ required: { value: true, message: 'Required.' } }}
                               />
                             </Field>
@@ -118,7 +117,7 @@ export const AmRoutesExpandedForm: FC<AmRoutesExpandedFormProps> = ({ onCancel,
                               error={errors.object_matchers?.[index]?.value?.message}
                             >
                               <Input
-                                {...register(`${localPath}.value`, { required: 'Field is required' })}
+                                {...register(`object_matchers.${index}.value`, { required: 'Field is required' })}
                                 defaultValue={field.value}
                                 placeholder="value"
                               />
@@ -209,38 +208,11 @@ export const AmRoutesExpandedForm: FC<AmRoutesExpandedFormProps> = ({ onCancel,
                 invalid={!!errors.groupWaitValue}
                 error={errors.groupWaitValue?.message}
               >
-                <>
-                  <div className={cx(formStyles.container, formStyles.timingContainer)}>
-                    <InputControl
-                      render={({ field, fieldState: { invalid } }) => (
-                        <Input
-                          {...field}
-                          className={formStyles.smallInput}
-                          invalid={invalid}
-                          aria-label="Group wait value"
-                        />
-                      )}
-                      control={control}
-                      name="groupWaitValue"
-                      rules={{
-                        validate: optionalPositiveInteger,
-                      }}
-                    />
-                    <InputControl
-                      render={({ field: { onChange, ref, ...field } }) => (
-                        <Select
-                          {...field}
-                          className={formStyles.input}
-                          onChange={(value) => onChange(mapSelectValueToString(value))}
-                          options={timeOptions}
-                          aria-label="Group wait type"
-                        />
-                      )}
-                      control={control}
-                      name="groupWaitValueType"
-                    />
-                  </div>
-                </>
+                <PromDurationInput
+                  {...register('groupWaitValue', { validate: promDurationValidator })}
+                  aria-label="Group wait value"
+                  className={formStyles.promDurationInput}
+                />
               </Field>
               <Field
                 label="Group interval"
@@ -248,38 +220,11 @@ export const AmRoutesExpandedForm: FC<AmRoutesExpandedFormProps> = ({ onCancel,
                 invalid={!!errors.groupIntervalValue}
                 error={errors.groupIntervalValue?.message}
               >
-                <>
-                  <div className={cx(formStyles.container, formStyles.timingContainer)}>
-                    <InputControl
-                      render={({ field, fieldState: { invalid } }) => (
-                        <Input
-                          {...field}
-                          className={formStyles.smallInput}
-                          invalid={invalid}
-                          aria-label="Group interval value"
-                        />
-                      )}
-                      control={control}
-                      name="groupIntervalValue"
-                      rules={{
-                        validate: optionalPositiveInteger,
-                      }}
-                    />
-                    <InputControl
-                      render={({ field: { onChange, ref, ...field } }) => (
-                        <Select
-                          {...field}
-                          className={formStyles.input}
-                          onChange={(value) => onChange(mapSelectValueToString(value))}
-                          options={timeOptions}
-                          aria-label="Group interval type"
-                        />
-                      )}
-                      control={control}
-                      name="groupIntervalValueType"
-                    />
-                  </div>
-                </>
+                <PromDurationInput
+                  {...register('groupIntervalValue', { validate: promDurationValidator })}
+                  aria-label="Group interval value"
+                  className={formStyles.promDurationInput}
+                />
               </Field>
               <Field
                 label="Repeat interval"
@@ -287,39 +232,11 @@ export const AmRoutesExpandedForm: FC<AmRoutesExpandedFormProps> = ({ onCancel,
                 invalid={!!errors.repeatIntervalValue}
                 error={errors.repeatIntervalValue?.message}
               >
-                <>
-                  <div className={cx(formStyles.container, formStyles.timingContainer)}>
-                    <InputControl
-                      render={({ field, fieldState: { invalid } }) => (
-                        <Input
-                          {...field}
-                          className={formStyles.smallInput}
-                          invalid={invalid}
-                          aria-label="Repeat interval value"
-                        />
-                      )}
-                      control={control}
-                      name="repeatIntervalValue"
-                      rules={{
-                        validate: optionalPositiveInteger,
-                      }}
-                    />
-                    <InputControl
-                      render={({ field: { onChange, ref, ...field } }) => (
-                        <Select
-                          {...field}
-                          className={formStyles.input}
-                          menuPlacement="top"
-                          onChange={(value) => onChange(mapSelectValueToString(value))}
-                          options={timeOptions}
-                          aria-label="Repeat interval type"
-                        />
-                      )}
-                      control={control}
-                      name="repeatIntervalValueType"
-                    />
-                  </div>
-                </>
+                <PromDurationInput
+                  {...register('repeatIntervalValue', { validate: promDurationValidator })}
+                  aria-label="Repeat interval value"
+                  className={formStyles.promDurationInput}
+                />
               </Field>
             </>
           )}
diff --git a/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedRead.tsx b/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedRead.tsx
index b5077ef0e16..39f62d75b82 100644
--- a/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedRead.tsx
+++ b/public/app/features/alerting/unified/components/amroutes/AmRoutesExpandedRead.tsx
@@ -33,13 +33,9 @@ export const AmRoutesExpandedRead: FC<AmRoutesExpandedReadProps> = ({
   const gridStyles = useStyles2(getGridStyles);
   const permissions = getNotificationsPermissions(alertManagerSourceName);
 
-  const groupWait = routes.groupWaitValue ? `${routes.groupWaitValue}${routes.groupWaitValueType}` : '-';
-  const groupInterval = routes.groupIntervalValue
-    ? `${routes.groupIntervalValue}${routes.groupIntervalValueType}`
-    : '-';
-  const repeatInterval = routes.repeatIntervalValue
-    ? `${routes.repeatIntervalValue}${routes.repeatIntervalValueType}`
-    : '-';
+  const groupWait = routes.groupWaitValue ?? '-';
+  const groupInterval = routes.groupIntervalValue ?? '-';
+  const repeatInterval = routes.repeatIntervalValue ?? '-';
 
   const [subroutes, setSubroutes] = useState(routes.routes);
   const [isAddMode, setIsAddMode] = useState(false);
diff --git a/public/app/features/alerting/unified/components/amroutes/AmRoutesTable.test.ts b/public/app/features/alerting/unified/components/amroutes/AmRoutesTable.test.ts
index 3af98341c40..92d8ec844e9 100644
--- a/public/app/features/alerting/unified/components/amroutes/AmRoutesTable.test.ts
+++ b/public/app/features/alerting/unified/components/amroutes/AmRoutesTable.test.ts
@@ -14,11 +14,8 @@ const defaultAmRoute: FormAmRoute = {
   groupBy: [],
   overrideTimings: false,
   groupWaitValue: '',
-  groupWaitValueType: '',
   groupIntervalValue: '',
-  groupIntervalValueType: '',
   repeatIntervalValue: '',
-  repeatIntervalValueType: '',
   muteTimeIntervals: [],
   routes: [],
 };
diff --git a/public/app/features/alerting/unified/components/amroutes/PromDurationDocs.tsx b/public/app/features/alerting/unified/components/amroutes/PromDurationDocs.tsx
new file mode 100644
index 00000000000..ca3f0488fd3
--- /dev/null
+++ b/public/app/features/alerting/unified/components/amroutes/PromDurationDocs.tsx
@@ -0,0 +1,68 @@
+import { css } from '@emotion/css';
+import React from 'react';
+
+import { GrafanaTheme2 } from '@grafana/data';
+import { useStyles2 } from '@grafana/ui';
+
+import { TimeOptions } from '../../types/time';
+
+export function PromDurationDocs() {
+  const styles = useStyles2(getPromDurationStyles);
+  return (
+    <div>
+      Prometheus duration format consist of a number followed by a time unit.
+      <br />
+      Different units can be combined for more granularity.
+      <hr />
+      <div className={styles.list}>
+        <div className={styles.header}>
+          <div>Symbol</div>
+          <div>Time unit</div>
+          <div>Example</div>
+        </div>
+        <PromDurationDocsTimeUnit unit={TimeOptions.seconds} name="seconds" example="20s" />
+        <PromDurationDocsTimeUnit unit={TimeOptions.minutes} name="minutes" example="10m" />
+        <PromDurationDocsTimeUnit unit={TimeOptions.hours} name="hours" example="4h" />
+        <PromDurationDocsTimeUnit unit={TimeOptions.days} name="days" example="3d" />
+        <PromDurationDocsTimeUnit unit={TimeOptions.weeks} name="weeks" example="2w" />
+        <div className={styles.examples}>
+          <div>Multiple units combined</div>
+          <code>1m30s, 2h30m20s, 1w2d</code>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+function PromDurationDocsTimeUnit({ unit, name, example }: { unit: TimeOptions; name: string; example: string }) {
+  const styles = useStyles2(getPromDurationStyles);
+
+  return (
+    <>
+      <div className={styles.unit}>{unit}</div>
+      <div>{name}</div>
+      <code>{example}</code>
+    </>
+  );
+}
+
+const getPromDurationStyles = (theme: GrafanaTheme2) => ({
+  unit: css`
+    font-weight: ${theme.typography.fontWeightBold};
+  `,
+  list: css`
+    display: grid;
+    grid-template-columns: max-content 1fr 2fr;
+    gap: ${theme.spacing(1, 3)};
+  `,
+  header: css`
+    display: contents;
+    font-weight: ${theme.typography.fontWeightBold};
+  `,
+  examples: css`
+    display: contents;
+    & > div {
+      grid-column: 1 / span 2;
+    }
+  `,
+});
diff --git a/public/app/features/alerting/unified/components/amroutes/PromDurationInput.tsx b/public/app/features/alerting/unified/components/amroutes/PromDurationInput.tsx
new file mode 100644
index 00000000000..5c873ee6563
--- /dev/null
+++ b/public/app/features/alerting/unified/components/amroutes/PromDurationInput.tsx
@@ -0,0 +1,25 @@
+import React from 'react';
+
+import { Icon, Input } from '@grafana/ui';
+
+import { HoverCard } from '../HoverCard';
+
+import { PromDurationDocs } from './PromDurationDocs';
+
+export const PromDurationInput = React.forwardRef<HTMLInputElement, React.ComponentProps<typeof Input>>(
+  (props, ref) => {
+    return (
+      <Input
+        suffix={
+          <HoverCard content={<PromDurationDocs />} disabled={false}>
+            <Icon name="info-circle" size="lg" />
+          </HoverCard>
+        }
+        {...props}
+        ref={ref}
+      />
+    );
+  }
+);
+
+PromDurationInput.displayName = 'PromDurationInput';
diff --git a/public/app/features/alerting/unified/components/amroutes/formStyles.ts b/public/app/features/alerting/unified/components/amroutes/formStyles.ts
index f61a525c080..7cb793af79d 100644
--- a/public/app/features/alerting/unified/components/amroutes/formStyles.ts
+++ b/public/app/features/alerting/unified/components/amroutes/formStyles.ts
@@ -16,11 +16,11 @@ export const getFormStyles = (theme: GrafanaTheme2) => {
     input: css`
       flex: 1;
     `,
-    timingContainer: css`
-      max-width: ${theme.spacing(33)};
+    promDurationInput: css`
+      max-width: ${theme.spacing(32)};
     `,
-    smallInput: css`
-      width: ${theme.spacing(6.5)};
+    timingFormContainer: css`
+      padding: ${theme.spacing(1)};
     `,
     linkText: css`
       text-decoration: underline;
diff --git a/public/app/features/alerting/unified/components/amroutes/timingOptions.ts b/public/app/features/alerting/unified/components/amroutes/timingOptions.ts
new file mode 100644
index 00000000000..62376d582ee
--- /dev/null
+++ b/public/app/features/alerting/unified/components/amroutes/timingOptions.ts
@@ -0,0 +1,11 @@
+export type TimingOptions = {
+  group_wait?: string;
+  group_interval?: string;
+  repeat_interval?: string;
+};
+
+export const TIMING_OPTIONS_DEFAULTS: Required<TimingOptions> = {
+  group_wait: '30s',
+  group_interval: '5m',
+  repeat_interval: '4h',
+};
diff --git a/public/app/features/alerting/unified/types/amroutes.ts b/public/app/features/alerting/unified/types/amroutes.ts
index 59c70e68983..f412a0e3c7f 100644
--- a/public/app/features/alerting/unified/types/amroutes.ts
+++ b/public/app/features/alerting/unified/types/amroutes.ts
@@ -9,11 +9,8 @@ export interface FormAmRoute {
   groupBy: string[];
   overrideTimings: boolean;
   groupWaitValue: string;
-  groupWaitValueType: string;
   groupIntervalValue: string;
-  groupIntervalValueType: string;
   repeatIntervalValue: string;
-  repeatIntervalValueType: string;
   muteTimeIntervals: string[];
   routes: FormAmRoute[];
 }
diff --git a/public/app/features/alerting/unified/utils/amroutes.ts b/public/app/features/alerting/unified/utils/amroutes.ts
index 57cde530c32..94e4548a74a 100644
--- a/public/app/features/alerting/unified/utils/amroutes.ts
+++ b/public/app/features/alerting/unified/utils/amroutes.ts
@@ -1,5 +1,4 @@
 import { isUndefined, omitBy } from 'lodash';
-import { Validate } from 'react-hook-form';
 
 import { SelectableValue } from '@grafana/data';
 import { MatcherOperator, Route } from 'app/plugins/datasource/alertmanager/types';
@@ -9,9 +8,7 @@ import { MatcherFieldValue } from '../types/silence-form';
 
 import { matcherToMatcherField, parseMatcher } from './alertmanager';
 import { GRAFANA_RULES_SOURCE_NAME } from './datasource';
-import { parseInterval, timeOptions } from './time';
-
-const defaultValueAndType: [string, string] = ['', ''];
+import { isValidPrometheusDuration } from './time';
 
 const matchersToArrayFieldMatchers = (
   matchers: Record<string, string> | undefined,
@@ -29,25 +26,6 @@ const matchersToArrayFieldMatchers = (
     [] as MatcherFieldValue[]
   );
 
-const intervalToValueAndType = (
-  strValue: string | undefined,
-  defaultValue?: typeof defaultValueAndType
-): [string, string] => {
-  if (!strValue) {
-    return defaultValue ?? defaultValueAndType;
-  }
-
-  const [value, valueType] = strValue ? parseInterval(strValue) : [undefined, undefined];
-
-  const timeOption = timeOptions.find((opt) => opt.value === valueType);
-
-  if (!value || !timeOption) {
-    return defaultValueAndType;
-  }
-
-  return [String(value), timeOption.value];
-};
-
 const selectableValueToString = (selectableValue: SelectableValue<string>): string => selectableValue.value!;
 
 const selectableValuesToStrings = (arr: Array<SelectableValue<string>> | undefined): string[] =>
@@ -79,11 +57,8 @@ export const emptyRoute: FormAmRoute = {
   receiver: '',
   overrideTimings: false,
   groupWaitValue: '',
-  groupWaitValueType: timeOptions[0].value,
   groupIntervalValue: '',
-  groupIntervalValueType: timeOptions[0].value,
   repeatIntervalValue: '',
-  repeatIntervalValueType: timeOptions[0].value,
   muteTimeIntervals: [],
 };
 
@@ -117,10 +92,6 @@ export const amRouteToFormAmRoute = (route: Route | undefined): [FormAmRoute, Re
         (matcher) => ({ name: matcher[0], operator: matcher[1], value: matcher[2] } as MatcherFieldValue)
       ) ?? [];
 
-  const [groupWaitValue, groupWaitValueType] = intervalToValueAndType(route.group_wait, ['', 's']);
-  const [groupIntervalValue, groupIntervalValueType] = intervalToValueAndType(route.group_interval, ['', 'm']);
-  const [repeatIntervalValue, repeatIntervalValueType] = intervalToValueAndType(route.repeat_interval, ['', 'h']);
-
   return [
     {
       id,
@@ -133,13 +104,10 @@ export const amRouteToFormAmRoute = (route: Route | undefined): [FormAmRoute, Re
       receiver: route.receiver ?? '',
       overrideGrouping: Array.isArray(route.group_by) && route.group_by.length !== 0,
       groupBy: route.group_by ?? [],
-      overrideTimings: [groupWaitValue, groupIntervalValue, repeatIntervalValue].some(Boolean),
-      groupWaitValue,
-      groupWaitValueType,
-      groupIntervalValue,
-      groupIntervalValueType,
-      repeatIntervalValue,
-      repeatIntervalValueType,
+      overrideTimings: [route.group_wait, route.group_interval, route.repeat_interval].some(Boolean),
+      groupWaitValue: route.group_wait ?? '',
+      groupIntervalValue: route.group_interval ?? '',
+      repeatIntervalValue: route.repeat_interval ?? '',
       routes: formRoutes,
       muteTimeIntervals: route.mute_time_intervals ?? [],
     },
@@ -154,28 +122,19 @@ export const formAmRouteToAmRoute = (
 ): Route => {
   const existing: Route | undefined = id2ExistingRoute[formAmRoute.id];
 
-  const {
-    overrideGrouping,
-    groupBy,
-    overrideTimings,
-    groupWaitValue,
-    groupWaitValueType,
-    groupIntervalValue,
-    groupIntervalValueType,
-    repeatIntervalValue,
-    repeatIntervalValueType,
-  } = formAmRoute;
+  const { overrideGrouping, groupBy, overrideTimings, groupWaitValue, groupIntervalValue, repeatIntervalValue } =
+    formAmRoute;
 
   const group_by = overrideGrouping && groupBy ? groupBy : [];
 
   const overrideGroupWait = overrideTimings && groupWaitValue;
-  const group_wait = overrideGroupWait ? `${groupWaitValue}${groupWaitValueType}` : undefined;
+  const group_wait = overrideGroupWait ? groupWaitValue : undefined;
 
   const overrideGroupInterval = overrideTimings && groupIntervalValue;
-  const group_interval = overrideGroupInterval ? `${groupIntervalValue}${groupIntervalValueType}` : undefined;
+  const group_interval = overrideGroupInterval ? groupIntervalValue : undefined;
 
   const overrideRepeatInterval = overrideTimings && repeatIntervalValue;
-  const repeat_interval = overrideRepeatInterval ? `${repeatIntervalValue}${repeatIntervalValueType}` : undefined;
+  const repeat_interval = overrideRepeatInterval ? repeatIntervalValue : undefined;
 
   const amRoute: Route = {
     ...(existing ?? {}),
@@ -235,10 +194,10 @@ export const mapMultiSelectValueToStrings = (
   return selectableValuesToStrings(selectableValues);
 };
 
-export const optionalPositiveInteger: Validate<string> = (value) => {
-  if (!value) {
-    return undefined;
+export function promDurationValidator(duration: string) {
+  if (duration.length === 0) {
+    return true;
   }
 
-  return !/^\d+$/.test(value) ? 'Must be a positive integer.' : undefined;
-};
+  return isValidPrometheusDuration(duration) || 'Invalid duration format. Must be {number}{time_unit}';
+}
diff --git a/public/app/features/alerting/unified/utils/time.ts b/public/app/features/alerting/unified/utils/time.ts
index 491c5b790ee..9a96fa1f4aa 100644
--- a/public/app/features/alerting/unified/utils/time.ts
+++ b/public/app/features/alerting/unified/utils/time.ts
@@ -1,4 +1,3 @@
-import { durationToMilliseconds, parseDuration } from '@grafana/data';
 import { describeInterval } from '@grafana/data/src/datetime/rangeutil';
 
 import { TimeOptions } from '../types/time';
@@ -28,10 +27,6 @@ export const timeOptions = Object.entries(TimeOptions).map(([key, value]) => ({
   value: value,
 }));
 
-export function parseDurationToMilliseconds(duration: string) {
-  return durationToMilliseconds(parseDuration(duration));
-}
-
 export function isValidPrometheusDuration(duration: string): boolean {
   try {
     parsePrometheusDuration(duration);