I find this a lot. I play with a guy, and he seems intent on going as long as humanly possible. I actually find it frustrating. I can only go so long with someone at a play party, no matter how much I am enjoying myself. I would much prefer they be really into it and ge toff in 5min, than keep holding back and take 15min to get off.
I have at times even resorted to 'making' them cum by using my muscles in such a way that they basically can't help it. I even once had a guy say "I didnt have a choice in that, did i?" about his cumming.
Too many guys seem to think they need to go forever to please a woman. Personally, the only time I can/want to go forever is with someone I love. If I am just playing at a party, I am just there for fun, and more than 10min fucking any one guy (not including foreplay, oral, etc) is too much.