Why not stick around for 2?  

I recall my first escort experience decades ago where the ad said "an hour", so after I came after about 15 minutes, I just assumed I'd get at least one more chance, but the gal, after coming out of the bathroom looked at me and asked why I wasn't dressed.

I've had a few gents leave shortly after their first round and yes, sometimes there is something in their demeanor that seems to indicate a guilty conscience or inability to relax afterward (can be a religious thing, performance related or a relational one) and sometimes it's just a busy schedule. All you can do is tune in to your gut, be accommodating and lightly suggestive/persuasive, and then let go. 🤷🏻‍♀️  He's a big boy and will do what he needs to, and do it better without your reaction adding to his psychological/emotional plate (not sayin', just sayin').😇

I'm friends with a lady and help her out with screening when she asks. She often tells me that the guy I screened booked a 2 hour appointment (or whatever time) and finished after 20 minutes and left.  

Did the gent or gents in question drag their dessicated husks from your boudoir with a look of overwrought bliss on their faces while saying softly "no mas--no mas"?  If so, sounds like your work here is done.

That happened on occasion in the distant past! Now I’m older, and with the help of a blue pill, the question is whether I pop at all, not if I pop early! I do hang until shower time if I happen to finish a few minutes early.  I never upgrade to two pops so I don’t expect additional sexy fun after the first pop.

I've not felt guilt, but yes:  we men undergo a huge transformation upon orgasm.  You know what it looks like from the outside.  From the inside, all we (or perhaps I should say I) see before orgasm is the nirvana of climax, the eruption, the Vesuvius, the glory of cumming, which we pursue single-mindedly without regard to literally anything else. It is all that matters and you, the provider, are essential.

If things are going well I will stick around knowing a second pop is very unlikely for me. I do respect a providers time and leave no later than 50 minutes. The providers who makes you want to stay are the best of the best.