Having chatted to them recently to find out when a particular girl I was hoping to see would be next on.
There is no rota and girls come and go as they please a few of the girls in the list may have not worked for a while but eventually their profile is taken off.
The Available Tonight page is updated twice a day
External Link/Members OnlyOnce between 1200-1330 for the day shift girls
Then later around 1700-1830 for the night shift girls
You call and say you want to see a girl assuming she in showing as Available Tonight.
That girl will call you back from Blocked Number, usually within a few mins and you arrange with her direct.
Most of the time the call handler/receptionist has been very helpful and motivated.
First time I called I asked about the details of the meet and the lady acted awkward and said you discuss that with the girl direct.
The girls themselves have been willing to discuss what they do and don't do.
Popular girls do seem to be worked very hard especially on the Night Shift.