If time is enough and you've seen the girl before, are they generally willing to give you another pop without twice the tip? How do you go about asking her?
i know with me and all the FBSM where i'm from MSOG (2 pops, 2 cups, whatever) are the norm.
i would suggest just asking for a beginning and an ending (in that way to be discrete in case the reply is no or an upsell for the extra pop).
It is almost certain that you'll get two pops if the place is worth its salt. Being almost 60 I usually ask for 90 minutes as I need more refractory time.
You do have to pay her somewhat more, maybe 50% more.
I've been to AMPs many times in many states, and I've only had a double at a few places. Most of the time they want you up & out ASAP. Some ladies will continue to massage you after your first pop if you have a 60 or 90 minute appointment, so if you can get hard again quickly, and get their attention to focus back on your woody, they may go along with it. Or they may not. If you find one that does, tip her well and request her every time you visit.
I had one young girl who was a wild thing - she tried to get me off as soon as possible, starting with the table shower, so she could give me a good massage, then go for the 2nd pop. I always tipped her well, and loved visiting her. Alas, she returned to Korea after a few months. But it was fun while it lasted!
I've had 2 pops before. Never any other way than this.
When I'm on my back on the body scrub table, and they start to soap up and stroke my dick. I've quickly gotten myself worked up enough to shoot a load. I don't ask. I just shoot.
Then once on the massage table I've gotten a second pop.