Correct

models/common/planner.go

@@ -1,7 +1,6 @@
 package common
 
 import (
-	"fmt"
 	"time"
 
 	"cloud.o-forge.io/core/oc-lib/models/common/pricing"
@@ -28,11 +27,16 @@ func GetPlannerNearestStart(start time.Time, planned map[tools.DataType]map[stri
 	return near
 }
 
+// GetPlannerLongestTime returns the sum of all processing durations (conservative estimate).
+// Returns -1 if any processing is a service (open-ended).
 func GetPlannerLongestTime(planned map[tools.DataType]map[string]pricing.PricedItemITF) float64 {
 	longestTime := float64(0)
 	for _, priced := range planned[tools.PROCESSING_RESOURCE] {
-		longestTime += priced.GetExplicitDurationInS()
-		fmt.Println("Longest", longestTime)
+		d := priced.GetExplicitDurationInS()
+		if d < 0 {
+			return -1 // service present: booking is open-ended
+		}
+		longestTime += d
 	}
 	return longestTime
 }