Well, I'm honestly only starting to play these because the past week or two has been midterm weeks and the play is generally slower and bad so I can study and play at the same time lolol.
I live in California
(so PST) and usually play anytime between 6 PM - 12AM. Those seem to be peak hours and they usually fill up within 5 minutes around those hours. I played a few at around 1-3 AM PST, and they filled up within 10-15 minutes which honestly isn't too bad in my opinion.
Average time would probably be about from 1 hour to 1.5 hour. By 1 hour mark the blinds are already 100/200, which is pretty ridiculous as most of the time there's about 4 players (maybe 5) left. That's an average stack of around 3k and blinds alone are already 10% of that. That's when you need to start making moves and stealing the blinds, as most players are going to start playing scared.