Cut off time?

There is a raid curfew. I don't recall exactly where I read about it, but there is.

I've read something about 9pm but idk if it's official. My own observation I only see raids starting at 8AM w/ 2hr timers and latest I participated in was 830PM with 30mins left on timer.

I did read somewhere that it's 9:00 PM local time. But I think that's approximate. I saw one with ~18 minutes left on the egg timer a little after 8:00 last night. So the actual raid would have been going on past 9:00.

Same observation here. After around 9pm there seem to be no more raids. And I can see well over 10 gyms from my apartment and I constantly have raids nearby during the day.