Sounds to me that the original poster is afraid that he will cum too fast the first time and then not be able to get it up again within the alloted time for a second go. I don't know what the answer is, but a few of the brothers have recommended in the past.........maybe a few hours before the appointment to give you time to recharge the old batteries sufficiently, but not to recharge them fully, if you get my meaning...............that will be the escort's job. Stay off the booze as well in advance.