I see one gal that gets me off twice every time, and often with just 15 minutes recharge time.
She is one hell of a mechanic, and super affectionate too.
That's why I've been going back to her for over 27 years.
Is 2 pop's the norm!??
The amount of time you buy, and your stamina.
Someone in their 30s and maybe 40s can usually get off two in an hour if they get the first shot in within say, 20 minutes, then wait about 20 minutes and start in again getting the last one in in just enough time to take a quick shower and dress.
Since I'm now in my 60s, I need at least two hours for two shots, and that's on a good day.
Most gals are in the MSOG catagory. Read the reviews to be sure
60 Rock On Brother!!!!
That is an excellent reason to read each lady's reviews.
Now, it would be easy to say "Yes, at a certain price-point and above, that is to be expected"...... but then you might manage to pick the one provider in your area who either does not allow this, or has an up-charge for it. Or only on dates longer than an hour or only with guys named Englebert. You just never know, so my best advice is to do as much homework as possible.
Read her reviews in their entirety, and if she has recent reviews that mention multiple rounds, you might also want to PM her reviewers to ask if this was a one-hour date or longer.
Whatever you do, please don't ask her! 
Lol.. i will not ask her
.. Because of most reviews I've read they speak of 2pop whether in an hour or two, that's why i was curious?
The fasted you reach "cup one" and the faster you are ready for "cup two" the more likely it will be for you to be offered/allowed that second cup.
If OTOH it takes you forty minutes (like myself) to finish your first cup, it's going to be very unlikely any sensible girl is going to offer you seconds in a one hour appointment. Now if you can finish your first cup in 10-15 minutes and are ready to go again 10-15 minutes later "most" women will allow or even encourage that second cup. As previous posters have advised though, I would read the reviews to see if others are getting that second cup, if none of her previous reviewers mention a second cup, you should not assume you are going to be the first to do so.
I began to focus on the journey more than the destination. Sometimes it is about all the sensual interaction not just the number of cups.
One thing not mentioned by others is the sexyness and skill of the lady contributes to the possibility of MSOG too.
I see one gal that gets me off twice every time, and often with just 15 minutes recharge time.
She is one hell of a mechanic, and super affectionate too.
That's why I've been going back to her for over 27 years.
Seems like you need the combination of a lot of scenario to come together for an awesome experience.
There are Providers who are literally "one and done" whether it's after 5 minutes or 50 minutes. They make you feel like you're just an ATM spurting some money and some juice, the faster the better. When done, they want to turn around and walk away.
There are Providers who are one-shot only but at least keep you entertained for the duration. They will sometimes offer a second shot for an extra fee.
Then, there are Providers who offer MSOG as part of their SOP. It isn't guaranteed to happen, but the possibility is there. Just to entertain the possibility of MSOG is a huge boost to the client. These are my favorite hostesses, not just because of the MSOG (which may or may not happen) but because it is indicative of their approach to the whole experience. Unrushed, caring, polite, naturally sexual, ...
By way of example, I might finish #1 early on, rest a bit and we begin round 2 but do not cross the finish line through no fault of hers. She made the effort. Other times, I might finish later yet still, with only 15 or 10 (or fewer!) minutes to go, she will offer to try for #2. I know it ain't gonna happen, she knows it ain't gonna happen but just a few minutes of extra attention is a vastly different experience from her SAYING, in words or actions, "You're done ... clean up ... get out." Just a few minutes of touching, stroking, sucking or whatever she tries sends as much of a surge to my big head as to my little head, frequently a lot MORE to my big head!
Some of my hostesses really try to make it happen and it is I who have to ask her to stop so we don't go overtime. That small effort is HUGE in my book.
To repeat: I know that #2 won't happen, she knows that #2 is a fantasy, but by playing it out she makes the whole experience MUCH much better for me