Alternatively, 3-6 quickies in a night can be amazing also where it may only last a few minutes each time but I wouldn’t consider it all to be the same session.
It really depends on what you mean as sex. I’ve answered as from first penetration rather than including forplay but it all depends on the partner and what is going to get her to cum before I do. If she is someone that is able to have multiple orgasms then it could take much longer and would go...