How long should I last?

"Average" is hard to gauge, because every guy is different! 15 to 25 minutes is great! Girls usually complain when sex is either too short or too long. Too short would be maybe 1 minute. Too long would be anything more than 30 minutes. Ideally, the girl wants time to enjoy herself and to be intimate with her partner, but if it goes on for too long, the vagina begins to feel raw and uncomfortable.
You don't need to try to go any longer! I'm sure your girlfriend is totally fine with the length of time you're giving her. Trust me, longer is not better! It just gets painful for the girl!
I hope this helps :-)

I don't think you are lasting long having sex

It's different for every woman. Personally I think 15-25 minutes is perfect. I wouldn't want sex to be hours and hours long. Even an hour is pretty long. If she is cumming twice by then I'd say she's pretty satisfied as well. Average is about 10-15 minutes with a guy.

that's about 14 to 24 minutes longer than me. :)

Quit freaking braggin you punk teenage kid and put up that hormonal viagra you are shooting up. And only twice.sheesh.25 minutes that woman should have enjoyed it at least 12 or 13 times. Just kidding. ROFL.

I lasted an hour once and had my wife begging me to stop. And that was without medication or liquor too. Oh to be young again.

What can I say kid.Enjoy it while ya can.

i can't last more than 10 minutes without cumming. I hate it. I say good job to you!

According to Masters and Johnson, the average time from penetration to orgasm for men is 7.3 minutes, so you're doing pretty well.