I'd say, on average about 11 hours a day but it's constantly on the brain thinking of new ideas, PC's are always switched on for whenever I need to hop on. I try to avoid working weekends but usually can't help myself.
I'd say, about 3-4 but that whiles on psp msn facebook you know the deal, since im 13 i cant really work my arse off for a measly 5£ A day im currently makeing (profit)
Laptop goes on around 8am then can still be working till 10pm monday to friday.
I Usually try to take the weekend off if there's nothing urgent but do keep check on things a few times per day.