I never had that problem of being out early. I think that's why a one hour booking is much better. A 30 minute booking is a quickie. I've lost ten minutes the very odd time, but it's rare.
I'd have no interest in Cumming before meeting someone.... If I'm meeting a girl I prefer the opposite.... Don't wank for few days, then I am sooo much hornier and everything feels so nice, the sensations even as she rubs my cock are amazing... And the O is so much more intense