diff --git a/policy/policy_test.go b/policy/policy_test.go
index c3e4ea2..7ccffbb 100644
--- a/policy/policy_test.go
+++ b/policy/policy_test.go
@@ -282,15 +282,18 @@ func TestCreateNotificationPolicy_Validate(t *testing.T) {
 	err = request.Validate()
 	assert.Nil(t, err)
 
-	request.DelayAction = &DelayAction{DelayOption: NextSunday, UntilHour: -3}
+	invalidHour, validHour := -3, 3
+	invalidMinute, validMinute := 60, 55
+
+	request.DelayAction = &DelayAction{DelayOption: NextSunday, UntilHour: &invalidHour}
 	err = request.Validate()
 	assert.Equal(t, "delayAction's UntilHour or UntilMinute is not valid", err.Error())
 
-	request.DelayAction = &DelayAction{DelayOption: NextSunday, UntilHour: 5, UntilMinute: 60}
+	request.DelayAction = &DelayAction{DelayOption: NextSunday, UntilHour: &validHour, UntilMinute: &invalidMinute}
 	err = request.Validate()
 	assert.Equal(t, "delayAction's UntilHour or UntilMinute is not valid", err.Error())
 
-	request.DelayAction = &DelayAction{DelayOption: NextSunday, UntilHour: 5, UntilMinute: 55}
+	request.DelayAction = &DelayAction{DelayOption: NextSunday, UntilHour: &validHour, UntilMinute: &validMinute}
 	err = request.Validate()
 	assert.Nil(t, err)
 
diff --git a/policy/request.go b/policy/request.go
index 7839bfd..5afc8c6 100644
--- a/policy/request.go
+++ b/policy/request.go
@@ -547,8 +547,8 @@ type DeDuplicationAction struct {
 
 type DelayAction struct {
 	DelayOption DelayType `json:"delayOption,omitempty"`
-	UntilMinute int       `json:"untilMinute,omitempty"`
-	UntilHour   int       `json:"untilHour,omitempty"`
+	UntilMinute *int      `json:"untilMinute,omitempty"`
+	UntilHour   *int      `json:"untilHour,omitempty"`
 	Duration    *Duration `json:"duration,omitempty"`
 }
 
@@ -667,12 +667,16 @@ func ValidateDelayAction(action DelayAction) error {
 			return err
 		}
 	}
-	if action.DelayOption != ForDuration && ((action.UntilHour < 0 || action.UntilHour > 23) || (action.UntilMinute < 0 || action.UntilMinute > 59)) {
+	if action.DelayOption != ForDuration && (!validDuration(action.UntilHour, 23) || !validDuration(action.UntilMinute, 59)) {
 		return errors.New("delayAction's UntilHour or UntilMinute is not valid")
 	}
 	return nil
 }
 
+func validDuration(value *int, max int) bool {
+	return value != nil && *value >= 0 && *value <= max
+}
+
 func ValidateResponders(responders *[]alert.Responder) error {
 	for _, responder := range *responders {
 		if responder.Type != alert.UserResponder && responder.Type != alert.TeamResponder {