Normally 1 hour, and 1 pop, I'm a bit of a slow starter and like spend 10 mins or so chatting , kissing and getting touchy feely, then plenty of oral, plough for half an hour or so then the big finale.
I see one regular (too often?) and nearly always for 2 hours, but she really can fuck for England and usually cums half a dozen times which I really enjoy.
Normally 1 hour of monkey-sex is quite enough, never done a 30 mins