Personally , almost always afternoons. More or less need to be during my working day so I can escape for an hour or two. I also enjoy if the girl is just "starting" , although not bothered if late afternoon and she clearly has had earlier punters. As long as I know they shower etc. & don't stack their bookings.
Once , I seen a girl I'd seen once before ...... Almost bumped into punter before me as he left.
I just turned & walked.
Once , a girl said , shit I've only 5 mins and wet wiped her fandango. Never been back.