I think the principle of you pay for the time, ie 30 mins, holds true, so if you are a quickshooter then perhaps it is only fair that you may try for round 2 if you think you are up to it and also if you consider the escort's thoughts on the matter.
If the principle of your time is up after round 1 then what happens if you have not cum after 30 mins, do you go into overtime till you shoot ? I don't think the girls would agree to that.! But my advice is if you're not sure how the apointment will go then book an hour and then you will have plenty of time to recover and a non rushed appointment is a better appointment.! OH and always ask the escort on the phone about her do's and dont's, better to know before the appointment than after, she's not clairvoyent after all !!
Nice one thanks for all the replies