diff --git a/python/lsst/pipe/drivers/constructCalibs.py b/python/lsst/pipe/drivers/constructCalibs.py
index d88e5c1..b7061f8 100644
--- a/python/lsst/pipe/drivers/constructCalibs.py
+++ b/python/lsst/pipe/drivers/constructCalibs.py
@@ -415,8 +415,8 @@ def batchWallTime(cls, time, parsedCmd, numCores):
         numCcds = len(parsedCmd.butler.get("camera"))
         numExps = len(cls.RunnerClass.getTargetList(
             parsedCmd)[0]['expRefList'])
-        numCycles = int(numCcds/float(numCores) + 0.5)
-        return time*numExps*numCycles
+        numCycles = int(numCcds*numExps/float(numCores) + 0.5)
+        return time*numCycles
 
     @classmethod
     def _makeArgumentParser(cls, *args, **kwargs):