I use for about 8 to 10 hours in a day. I will participate in the forums and enjoy my time. Sometimes, i work.
I always use PC for many reasons. I use PC when I am at my work place and I also use PC when i am at home for more extra money online.
I work online. So I use the computer between 3 to 4 hours per day. If I'm doing research I am online longer. However, I always take breaks every hour or two.
I use it a lot for my affiliate marketing now. Usually 6 - 7 hours a day. With the use of the software my working time is little reduced and making everything work on autopilot. Smart isn't it.
I use my computer everyday like its me, if im awake then the computer is on. ....when i sleep it sleeps.