I'd imagine at 2am in the morning (depending on everyone's timezone) you'd be lucky to get any warning at all if someone is starting to fall asleep for example. They aren't going to stick around for 30 minutes.
On the other hand this type of thing doesn't really both me as I don't set up groups for specific locations or camps, dungeons etc. I just show up, if I can get a group cool, if I don't then on to the next adventure
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