I used to spend between 8 - 24 hours on my computer a day. Sometimes I'd go without sleep for 5 days or more and spend most of that time in this chair. Not healthy .
Right now I'm spending maybe 3 hours on it a day, sometimes more. Some days I don't use it at all. It just depends on if I'm working or not. I also spend my weekends with friends more often these days.
I used to be in the 8+ range but recently my social life exploded and I'm only on around 3-4 hours. ^_^.
I'm on for 8+ hours a day and still have a great social life I'm on from about 11-7 (around there) and then i'm off with the friends. So far i've done good at juggling both friends and work to my surprise.