I don't know about the other ladies, but I don't put any sort of limitations except for what isn't on the menu. If you're good for two or thee or five rounds and don't go over your time, then more power to ya!
Or simply ask when you are setting up your meeting.
Some do not advertise, but simply verify prior to the actual appointment if they are ok with that.
Some will want to upcharge, some you may not have time for a 2nd or more.
Even in some of my 90 min sessions, I have done other things that did not allow for more than 1.
Tit for tat give me as many & I'll do you even better
may it be from BBBJ or HJ or FS to Russian I love to see it in my tits
MSOG ... hr or longer ..
Be sure to ask the lady before you book ....
I encourage and often am the initiator of the 2nd round (i've been able to get 3rd out of a few within 1hr too).
It should be customary especially if there's ample time left and I feel safe assuming most allow it in 1hr or more without an extra fee.
BUT there are some out there who have an upcharge for MSOG.
Gents doing research is important because some advertise the difference in those rates upfront (for ex. I've seen 250hr and followed with 300hr MSOG).
I'd also be careful about ladies explicit questions (some guys think if they write it in code/abbreviations it doesn't sound like 'sex act for $' anymore) esp before she's been able to screen them.
Some don't take that well and some are fine with it.