Usually I can only play in short sessions. I can play for like a half hour to an hour, then come back later and play for another hour, ect. I do this maybe 3 times a day. This is unless I get my hands on something very addictive, which is a rare occasion. Last time I found an extremely addictive game was KOTOR on the Xbox, which I played like 10 hours straight one day.
Usually though I will put in like maybe 6 hours a week, if that.