How long does sex last for you?

The other day I just got finished having sex with Kim and a question came across my mind... How long does the average guy last for sex? She gave me head for about 10 minutes and then we fucked for about 15 all together it was about 25 minutes. So what is this the average time for most guys? I've put a new poll up on the blog (I know there hasn't been one for a while - sorry).