Few times on a week describes my gaming habits best during most of the year. I'm a kind of person who doesn't want to play just for an hour or so. If I play, I play for the whole evening, no distractions allowed. I have to feel relaxed and know that I have no other obligations waiting to be fullfilled. Thus I happen to play mostly at saturdays and sundays. Sometimes I game on working days too, but its a rarity to find time for a long rpg session outside weekends.
I just don't feel like launching a rpg unless I know that I can really have time to enjoy it. If my timetable is limited, but I wish to game a bit, its mostly action oriented - like a few rounds of tf2 before going to sleep or couple of missions of assasin's creed 2 etc