I'm not sure, I have only 2 or 3 hours to be able to game everyday after work before going to sleep, but I don't always do it. When I do, it's 2 hours.
I'm free on the weekends, so I can game practically all day, but I normally go out with friends, so, I don't do it too much either, at least not on Saturdays.
When I really game, is on Sundays, and for that, I'd say I do it for 3 hours.
It varies a lot with me.