I spent almost 12 hours per day on my computer. May be it too much. But my computer entertaining me a lot. I am enjoying with my computer.
We need to count that we spent time with computer in work and at home. So it can be even 12 hours daily.
Probably most of my day just as I wake up since I work on the internet. I do think It's normal because it provides me a living, and on the weekends I still go out to party.