Show patience and let your woman orgasm before you cum and in all else will she forgive your impatience.
Its fucking easy to do that, since I sometimes last for hours before I can finish.
they say that over twenty minutes and most women begin to feel raw. Lasting a long time isn't necessarily a good thing. The point I am trying to make is that you should last just long enough.
Masturbation helps control orgasm.
It strongly depends on other factors (TONS of them) how long a guy would "ideally" last. A guy not being able to get off for hour*s*, plural, sounds more frustrating than fun to me, but 20 minutes sounds like a bit of a gyp, if everything else is going right. Prolly also depends on what you count as sex.