Mid morning and mid afternoon have been pretty reasonable most days.
It took almost a month for the crowds to die down at the Cicero location. If you hit non-meal times it is not bad already. Only took me 12 minutes yesterday at 11:00 am
The lines move fairly quick 20 - 30 min at dinner time 6ish, if you go inside.
Keep an eye on traffic in google maps. Particularly the side streets. Greece PD is routing the drive thru around the adjoining neighborhood. So if the traffic shows orange/red, you know there is a line to get into the drive thru, which also means no parking.
Good Luck...Still long lines last week & unbelievable traffic after a few weeks now!
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