basically...however i've found that having sex that lasts too long is kinda painful in the wrong ways to both parties, so i try to gauge how quickly she is going to finish and try to match or finish soon after. Sometimes that's hours long and sometimes it's 15 minutes. lately, i prefer the hours bc i don't know when i'll get to do the activity again
as for with myself, i can spend two or three hours driving myself nuts, but sometimes, that leads to chafing