diff --git a/public/app/features/alerting/unified/components/rule-editor/GrafanaEvaluationBehavior.tsx b/public/app/features/alerting/unified/components/rule-editor/GrafanaEvaluationBehavior.tsx
index 5833c36bac4..d0f6672c41c 100644
--- a/public/app/features/alerting/unified/components/rule-editor/GrafanaEvaluationBehavior.tsx
+++ b/public/app/features/alerting/unified/components/rule-editor/GrafanaEvaluationBehavior.tsx
@@ -57,7 +57,7 @@ const forValidationOptions = (evaluateEvery: string): RegisterOptions => ({
         const millisEvery = parsePrometheusDuration(evaluateEvery);
         return millisFor >= millisEvery
           ? true
-          : 'For duration must be greater than or equal to the evaluation interval.';
+          : 'Pending period must be greater than or equal to the evaluation interval.';
       } catch (err) {
         // if we fail to parse "every", assume validation is successful, or the error messages
         // will overlap in the UI
diff --git a/public/app/features/alerting/unified/components/rules/EditRuleGroupModal.tsx b/public/app/features/alerting/unified/components/rules/EditRuleGroupModal.tsx
index feb3f46d748..bc24dd8be88 100644
--- a/public/app/features/alerting/unified/components/rules/EditRuleGroupModal.tsx
+++ b/public/app/features/alerting/unified/components/rules/EditRuleGroupModal.tsx
@@ -82,7 +82,7 @@ export const RulesForGroupTable = ({ rulesWithoutRecordingRules }: { rulesWithou
       },
       {
         id: 'for',
-        label: 'For',
+        label: 'Pending period',
         renderCell: ({ data: { forDuration } }) => {
           return <>{forDuration}</>;
         },
diff --git a/public/app/features/alerting/unified/components/rules/RuleDetails.tsx b/public/app/features/alerting/unified/components/rules/RuleDetails.tsx
index 070622f132c..cf6800f43d0 100644
--- a/public/app/features/alerting/unified/components/rules/RuleDetails.tsx
+++ b/public/app/features/alerting/unified/components/rules/RuleDetails.tsx
@@ -72,7 +72,7 @@ const EvaluationBehaviorSummary = ({ rule }: EvaluationBehaviorSummaryProps) =>
 
   // recording rules don't have a for duration
   if (!isRecordingRulerRule(rule.rulerRule)) {
-    forDuration = rule.rulerRule?.for;
+    forDuration = rule.rulerRule?.for ?? '0s';
   }
 
   return (
@@ -82,11 +82,10 @@ const EvaluationBehaviorSummary = ({ rule }: EvaluationBehaviorSummaryProps) =>
           Every {every}
         </DetailsField>
       )}
-      {forDuration && (
-        <DetailsField label="For" horizontal={true}>
-          {forDuration}
-        </DetailsField>
-      )}
+
+      <DetailsField label="Pending period" horizontal={true}>
+        {forDuration}
+      </DetailsField>
 
       {lastEvaluation && !isNullDate(lastEvaluation) && (
         <DetailsField label="Last evaluation" horizontal={true}>
diff --git a/public/app/features/alerting/unified/utils/rule-form.ts b/public/app/features/alerting/unified/utils/rule-form.ts
index ac37e3c4402..71c4aff9861 100644
--- a/public/app/features/alerting/unified/utils/rule-form.ts
+++ b/public/app/features/alerting/unified/utils/rule-form.ts
@@ -330,9 +330,7 @@ export function alertingRulerRuleToRuleForm(
 > {
   const defaultFormValues = getDefaultFormValues();
 
-  const [forTime, forTimeUnit] = rule.for
-    ? parseInterval(rule.for)
-    : [defaultFormValues.forTime, defaultFormValues.forTimeUnit];
+  const [forTime, forTimeUnit] = rule.for ? parseInterval(rule.for) : [0, 's'];
 
   const [keepFiringForTime, keepFiringForTimeUnit] = rule.keep_firing_for
     ? parseInterval(rule.keep_firing_for)
diff --git a/public/app/features/alerting/unified/utils/rules.ts b/public/app/features/alerting/unified/utils/rules.ts
index 05759a8df69..3885db0d20d 100644
--- a/public/app/features/alerting/unified/utils/rules.ts
+++ b/public/app/features/alerting/unified/utils/rules.ts
@@ -229,8 +229,8 @@ export const getAlertInfo = (alert: RulerRuleDTO, currentEvaluation: string): Al
   if (isAlertingRulerRule(alert)) {
     return {
       alertName: alert.alert,
-      forDuration: alert.for ?? '1m',
-      evaluationsToFire: getNumberEvaluationsToStartAlerting(alert.for ?? '1m', currentEvaluation),
+      forDuration: alert.for ?? '0s',
+      evaluationsToFire: getNumberEvaluationsToStartAlerting(alert.for ?? '0s', currentEvaluation),
     };
   }
   return emptyAlert;