I may not be exactly at the range you wonder about, but I'm close and have lady friends who are.

Speaking for myself: Generally 3 - 5 gentlemen a month, and almost always the same gents. I make about four new acquaintances a year. My average date is four nights long, or a dinner date. I have three long term arrangements that have been active between 3 - 6 years.

Ladies I know never exceed one or two individual gents a week.

The answer could be anywhere from zero to five.  Most girls in that range see guys for extended hours, so the answer varies .

...a version of this question has been asked?  Do a freakin' search!  No, don't.  Because all you're really asking is the peurile question about how much hookers fuck.  Why?  Does that get you off?  Are you jerking off while you write your post or read the answers?  Oh, well, it's a sex site and we get all kinds...

Re: Up to 3

I don't totally buy the illusion. I think they're happy to take 2 or 3 appointments if they can get them.
 Usually if I see one after a client dinner I'm her last for the day. On the other hand, sometimes if I go at 6 or 7 pm she cleans up after and is "running off to meet a friend for dinner."
 It doesn't bother me that much - a nooner, a 4pm or 5 and one later in the evening? If they can't handle that ... they're not young enough for me.