For me hours can melt away. When I have lots of uninterrupted time, I start off in my underwear and scan the various TS sites, and items I have on hand (interesting choice of words).
As things get interesting quick, the "chosen ones" allow me to remove my underwear. Usually by this time there is a nice moist patch of precum that I play with. I have a couple of vibrators at my disposal that I buzz the head of my dick with and also buzz and insert in my ass. I'll alternate with plain old fashioned jerking to keep it sustained - pure vibrators can quickly end the session. With the vibrators buzzing away I will explode in pure satisfaction. I've also tried some of the tips on this site and sucked off cucumbers etc and knawed on my vibrators. When I've been short on batteries and have only my hands, I have lifted my legs in the air to cum on my face. :D