I've never tried 30 mins as I think it would be too rushed. 7-10 mins both ends of the slot to get ready/shower that would only leave potentially 10 mins of play time for 30 mins. If I just wanted to get off as quickly as possible it might be enough time, but I can do that at home. I'm paying to enjoy the cute girl. Though I'd love to be able to enjoy the session with this amount of time if I could to save on cost.
45 mins is perfect for me. Enough time to do everything I want. Foreplay, action, clean up, bask in the afterglow, chat with the girl.
I just tried doing 2 shots in a 1 hr slot for the first time but it didn't happen
, so now 1 hr is the awkward one. A bit too long for one shot.