diff --git a/README.md b/README.md
index 70c8ba5..6da11f6 100644
--- a/README.md
+++ b/README.md
@@ -187,7 +187,8 @@ spec:
 
 ### [Boost duration] fixed time
 
-Define the fixed amount of time, the resource boost effect will last for it since the POD's creation.
+Define the fixed amount of time, the resource boost effect will last for it since the
+**POD's schedule time**.
 
 ```yaml
 spec:
diff --git a/internal/boost/duration/fixed.go b/internal/boost/duration/fixed.go
index 1060174..fdee18f 100644
--- a/internal/boost/duration/fixed.go
+++ b/internal/boost/duration/fixed.go
@@ -52,5 +52,10 @@ func (p *FixedDurationPolicy) Duration() time.Duration {
 
 func (p *FixedDurationPolicy) Valid(pod *v1.Pod) bool {
 	now := p.timeFunc()
-	return pod.CreationTimestamp.Add(p.duration).After(now)
+	for _, condition := range pod.Status.Conditions {
+		if condition.Type == v1.PodScheduled && condition.Status == v1.ConditionTrue {
+			return condition.LastTransitionTime.Add(p.duration).After(now)
+		}
+	}
+	return true
 }
diff --git a/internal/boost/duration/fixed_test.go b/internal/boost/duration/fixed_test.go
index eba7c10..3c34fd1 100644
--- a/internal/boost/duration/fixed_test.go
+++ b/internal/boost/duration/fixed_test.go
@@ -20,6 +20,7 @@ import (
 	"github.com/google/kube-startup-cpu-boost/internal/boost/duration"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
@@ -39,17 +40,33 @@ var _ = Describe("FixedDurationPolicy", func() {
 	})
 
 	Describe("Validates POD", func() {
+		When("the POD has no status conditions", func() {
+			It("returns policy is valid", func() {
+				pod.Status.Conditions = []v1.PodCondition{}
+				Expect(policy.Valid(pod)).To(BeTrue())
+			})
+		})
 		When("the life time of a POD exceeds the policy duration", func() {
 			It("returns policy is not valid", func() {
-				creationTimesamp := now.Add(-1 * timeDuration).Add(-1 * time.Minute)
-				pod.CreationTimestamp = metav1.NewTime(creationTimesamp)
+				scheduleTime := now.Add(-1 * timeDuration).Add(-1 * time.Minute)
+				pod.Status.Conditions = []v1.PodCondition{
+					{
+						LastTransitionTime: metav1.NewTime(scheduleTime),
+						Type:               v1.PodScheduled,
+						Status:             v1.ConditionTrue,
+					}}
 				Expect(policy.Valid(pod)).To(BeFalse())
 			})
 		})
 		When("the life time of a POD is within policy duration", func() {
 			It("returns policy is valid", func() {
-				creationTimesamp := now.Add(-1 * timeDuration).Add(1 * time.Minute)
-				pod.CreationTimestamp = metav1.NewTime(creationTimesamp)
+				scheduleTime := now.Add(-1 * timeDuration).Add(1 * time.Minute)
+				pod.Status.Conditions = []v1.PodCondition{
+					{
+						LastTransitionTime: metav1.NewTime(scheduleTime),
+						Type:               v1.PodScheduled,
+						Status:             v1.ConditionTrue,
+					}}
 				Expect(policy.Valid(pod)).To(BeTrue())
 			})
 		})
diff --git a/internal/boost/manager_test.go b/internal/boost/manager_test.go
index 2f55735..b564bfc 100644
--- a/internal/boost/manager_test.go
+++ b/internal/boost/manager_test.go
@@ -434,10 +434,15 @@ var _ = Describe("Manager", func() {
 				durationSeconds = 60
 
 				pod = podTemplate.DeepCopy()
-				creationTimestamp := time.Now().
+				scheduledTimestamp := time.Now().
 					Add(-1 * time.Duration(durationSeconds) * time.Second).
 					Add(-1 * time.Minute)
-				pod.CreationTimestamp = metav1.NewTime(creationTimestamp)
+				pod.Status.Conditions = []corev1.PodCondition{
+					{
+						LastTransitionTime: metav1.NewTime(scheduledTimestamp),
+						Type:               corev1.PodScheduled,
+						Status:             corev1.ConditionTrue,
+					}}
 				mockClient = mock.NewMockClient(mockCtrl)
 				mockReconciler = mock.NewMockReconciler(mockCtrl)