I guess a tablet counts... since I do the same thing with a computer: manga and MH. Mostly at school, though... the easy life of an east-Slovak student in the last year of secondary school
Around 12-15 hours a day.. Not that much when the DSL line lets me down like today
I spend at least five hours. Whether I come home from work or class, I usually open up my laptop and dick around, though I tend to multitask and play video games.
On a work week, about 14 hours; since I'm on the laptop at work then I'll come home and jump straight back onto my own. I shall be cutting down on this, I fear for my eyes.( Well it's a bit late to fear, the damage is done now...)
I don't know how to count, LOL~ On normal school days, when I am not at uni, when I stay at my room, my laptop will always be online except when I sleep. That means it will be around 6-8 hours per day. On holidays, it depends on my activity, but generally I'm on more to watch things or browse sites. My laptop can be online around 12 hours at such time, or more. XD
I think I have to separate between computer usage for entertainment purposes and other purposes.. Normally during weekdays I use my computer/laptop for around 1.5 hour to 3 hours for entertainment purposes (reading, foruming, browsing, etc) and up to 4 hours during weekends. As for work related stuff (college tasks, writing duties, etc) I use my computer a little bit more.. I could stay in front of my computer for 6-8 hours per day. Too bad I limit myself not to have internet connection at work
I'm always in front of my PC, except when I'm at school staying in front of other PCs...
I have been using my computer to study, so i guess i use it for more than 8h per day currently.
But i try to take break every hour to rest my eyes and stretch my legs (i take the time to water my plants, clean the room, etc).