My computer is on, the majority of the time, sometimes I will spend 3-4 hrs at a time on it, however it is hard to distinguish my work time to leisure time as I am always doing something related to work but I find myself flicking to the forums or other sites for snatches of time.
I am not a great gamer, and tend to use my xbox for that, well unless its Rome:Total War and then its 2-3 hours at a time.