how long should i pleasure - myself?

I've done it for a couple of hours, it's called edging. Get to point where you are about to cum, stop, and gradually work up to ogasm again continuing this pattern until you want to orgasm. It's great fun but can be time consuming.

I'm a 15 year old girl and do it about 1 time a week. I normally lay in bed and watch some p*rn until I start getting aroused. Then I rub till I orgasm. The whole process takes about an hour!