I would happy to not cum for a half an hour. Now, there are times when I just can't get going at all, but when I do, it seems that I am shooting much sooner than I would like. When I was fucking my last wife, I would try hard to keep from cumming for her benefit. But, when she really started to get into it, she would start rubbing her clit on me really hard, and that would set me off. Never failed. It was very frustrating for both of us.
A few years earlier, I had a gf who liked for me to get in her and we would not move much. Just enough for me to stay hard and she liked the feel of the head of my dick moving deep in her. We managed to stay that way for well over an hour more than once. We would cum together eventually. We both enjoyed the connection and conversation.
The first time I did this was with my first wife with her laying on me and me in her for at least a couple hours. We were newly wed and had a really intimate conversation and enjoyed my being in her. We just moved enough for me to stay hard, which wasn't really hard to do because of the situation. Occasionally we would go to sleep with me still in her.