well I was just using 2 hours as an example
The point still stands that it's ok if you have good sex in 5 minutes.
Something else I noticed in the OP is that you get off before SHE wants you to. If that's the case, then switch positions when you feel like you're getting close. Let her get back on top since you can last longer that way. You guys are babies at having sex.. let things evolve how they should. Don't put pressure on each other by thinking sex has to last a certain amount of time. Just have fun and enjoy it. That's what sex is all about.