I'd usually play for a couple hours every day, maybe more when I've got a big or particularly addictive game going. Thanks to a very busy few months, it's recently dwindled to... maybe three or four hours a week, spread over a couple of sessions. I don't think this is likely to increase any time soon - the World Cup is still on for another three weeks, I'm working weekday mornings throughout the summer and will probably be getting an evening job to go with it, then come September I'll quite likely be away all week and only able to play at weekends.
...maybe I need to get a PSP or DS so I can play on my travels. Oh wait, no, I bought them both on release day and sold them a while later having never used them.