diff --git a/models/resources/priced_resource.go b/models/resources/priced_resource.go
index f1fa798..a412cd6 100755
--- a/models/resources/priced_resource.go
+++ b/models/resources/priced_resource.go
@@ -122,7 +122,11 @@ func (abs *PricedResource[T]) GetExplicitDurationInS() float64 {
 			add := abs.BookingConfiguration.UsageStart.Add(5 * time.Minute)
 			abs.BookingConfiguration.UsageEnd = &add
 		}
-		return abs.BookingConfiguration.UsageEnd.Sub(*abs.BookingConfiguration.UsageStart).Seconds()
+		d := abs.BookingConfiguration.UsageEnd.Sub(*abs.BookingConfiguration.UsageStart).Seconds()
+		if d <= 0 {
+			return (5 * time.Minute).Seconds()
+		}
+		return d
 	}
 	return abs.BookingConfiguration.ExplicitBookingDurationS
 }
diff --git a/models/workflow_execution/workflow_execution.go b/models/workflow_execution/workflow_execution.go
index 75de43c..217067e 100755
--- a/models/workflow_execution/workflow_execution.go
+++ b/models/workflow_execution/workflow_execution.go
@@ -217,7 +217,7 @@ func (d *WorkflowExecution) bookEach(executionsID string, wfID string, dt tools.
 		}
 		durationS := priced.GetExplicitDurationInS()
 		var endDate *time.Time
-		if durationS >= 0 {
+		if durationS > 0 {
 			e := start.Add(time.Duration(durationS) * time.Second)
 			endDate = &e
 		}