If it pops 21hrs on the dot it has to move back ToD wise every day, that actually ensures it has to pop in a different time zone after a few days, day 1 - pop 9 PM, then 6 PM, then 3 PM, then noon. how will this exclude if ToD is constantly moving back? 20hrs on the dot sounds better since they need to make NM unzergable and take at least 30m to kill.