Depends on a few things. What I’m after in terms of action (if its a P&D 30 minutes, if it’s BDSM 90 mins, at least) and, probably more importantly, if it’s a risky punt, by which I mean ‘this could be shit and I don’t know if we’ll connect’ - 30 minutes.
A longer booking is awful if you don’t connect (both mentally and physically i.e. you’re actually attracted to the SP).
I think I’ve done pretty well in terms of judging it. The only mistake I’ve made was with a civie where I arranged for her to stay overnight in my hotel. I wasn’t into her at all and lost the will 5 minutes into doggy. She spent the night groping me on and off hoping I’d get back to fucking her. It was terrible.
One of my earlier punts was with a polish girl who I booked for 1.5 hours and she ended up staying for 4. We totally connected instantly and it was possibly my best ever punt. We arranged to meet the following week but then my work schedule changed (I saw her while on business) and unfortunately she disappeared off the scene before I got to see her again.
Sometimes I’ll go for a shorter booking if I’m not sure, and have some extra cash in case things are going particularly well.
Some SP’s I’d happily spend a day with (obviously assuming we’ve met before). I’ve even cooked dinner for some (off the clock).