I've never actually kept track of how much time per day I use my iPad. I Would guess at least 4 and probably closer to 6 or 8, sometimes more if I am reading a good book. That is my weakness, I go to bed and read and time disappears......2 or 3 hours goes by like nothing!
2 to 5 hours a day. It's become automatic to take it with me at the breakfast table, lunch, the can, tv and a good read before sleep. So I use it every day for sure...
I'd say I've used it for about 1500 hours. That's an average $0.57 an hour. If you figure the price of most entertainment per hour, it's a steal!