Mon-Fri 1pm- 4pm is definitely the most common day/time requests for me. I think it depends on if the girl is local or traveling and if incall or outcall primarily.  Local incall the requests are more so during business hours because the friends are using their 9-5 as a coverage.  Weekends seem to fall into outcall for me.

none of our business.  As long as the lady treats you like a king while you are together, what does it mater?

Are extremely low volume and only see one or two people in a day. Therefore, their busy time would vary from day to day depending on when the one guy that day want to see them