diff --git a/aman/sys/aco/Colony.py b/aman/sys/aco/Colony.py
index f1fae9f..f834bd0 100644
--- a/aman/sys/aco/Colony.py
+++ b/aman/sys/aco/Colony.py
@@ -121,6 +121,10 @@ class Colony:
                 if None == bestSequence or bestCandidate[0] < bestSequence[0]:
                     bestSequence = bestCandidate
 
+                # found the optimal solution
+                if 1 >= bestSequence[0].total_seconds():
+                    break
+
         # create the final sequence
         self.Result = []
         rwyManager = RunwayManager(self.Configuration)