Wouldn't they be tired by 10 pm? I cannot imagine seeing them after they been with 8-10 guys LOL. That is just me.
There are morning people and evening people. The same way some can wake up at 5am, run 10 miles and crash at 9pm. Some roll out of bed at 10, actually wake up after a late lunch, and party til 2am.
Also, the average number of clients is 5-6 (based on old police reports). Like any other job, regular breaks for meals and just rest is important. C-orgs who rush by the 1/2 hour probably can do 10+
Kind of why reviews can vary so much, as a daywalker who has peak energy at 2pm banging the shit out of a nightowl who may have just ate (or starving, eating at 3pm).