My venue is doing Tyranny of Dragons as the 200 point league format (i.e., you play one game a week over the course of the month). Our games have a 90 minute timer and going to time is quite common -- just something to consider. I do think the larger format is a lot of fun, and I've never found myself wishing the games were over sooner.
This one is the one night 3 game format still. It starts at 7:30PM which makes me think that they are going to limit to 1 hour. Maybe they do an hour and a half though and plan to go to midnight, not sure as this is not a usual store I go to.
I kind of like the 1 hour time limit, it makes every point more important if tabling is less likely.