It varies heavily, I haven't played on it in over a week right now but if I'm in the mood for some RTS/4X/arcade/Elder Scrolls games then it goes up to 10 hours a week.
Back when I used to play online shooters and MMOs it used to be at least 3-4 hours each day but I don't play those anymore. On top of that, I've become a lot more picky over the games I play so I probably only play like 5% of the game in my Steam library and the rest I pretend they don't exist.







