Reception end time.

1 hour prior. so 10PM reception done gives you 1 hr to clear out decorations get cars packed up and get everything done.

We had to be out of daughter's venue by 10:30. The things we were responsible for sound kind of like what you're anticipating for your "clean-up" -- packing personal items and getting them to the car. Daughter's DOC was responsible for packing (decor, a few gifts, the card box, remaining floral arrangements, etc.) and getting everything up to the lobby (we were on a lower level) so all FOB had to do was actually put it in the car. The last song ended at 10. It took daughter and SIL awhile to say good-bye to their friends (no exit), they and their photographer were the last in the venue (he got some gorgeous photos of them in the empty space), and we were all out of the building before 10:30. They got in the Uber to the hotel and we took the SUV full of stuff home.

We have the reception room until midnight, but we are ending at 11 PM because of clean up and the DJ is only scheduled till 11 PM. That gives an hour to clean up.

I'd say 10:00 p.m. That gives you 1 hour, which should be enough time to clean up and keep you from having to rush.