Not nearly enough lately...
Our group plays on Monday nights. If I'm lucky I get off work in time and get there ~6:00. As the afternoon
Living Greyhawk game usually ends at the same time I get there, we all get together and grab a quick bite at a fast food joint down the street. So if we're lucky, we start at 6:30... usually ends up being 7:00.
The other game at the store Monday nights, in which the manager plays, usually ends at 10:00 to 10:30, rarely 11:00. When the manager's done playing, it is time to leave. So at best we're looking at ~4.5 hours, at worst 3.0 hours. We try to keep the jabbering, yakking, and reminiscing to a minimum, but that still soaks up more time than I'd like... but that's the nature of the game. It's far less a problem when we play a board game, as you can roll, move, and gab all at once...
So, on average, call it 2 to 3 hours of actual, honest gaming each Monday night.
And to top it off, we are alternating sessions, one session
Rifts, the other
Castles & Crusades... so story and character advancement is slooooow...