Short answer ... NoEach provider decides what they will offer (what's on the menu). In Bay Area, most $$ providers do one pop only. Additional pops require additional tip (and arrange with RA at beginning) or additional time (add another half or full hour session). If you want a provider that does MSOG within a single one hour session (very difficult to achieve in half hour session unless you are in your teens or early 20's), you can search through the ads and reviews to find providers that offer that service.
When I used to see SWs, it was always pop and go.
In LA you can find providers that allow only one pop for a 1 hour session, some that will try for 2x and if you are up to the challenge, there are some that will keep on going till you are all dried up or time expires. You will have to search through the reviews to find what you are looking for.
There are no guidelines/rules that says what a one hour session should include. Each provider determines what is offered, how it is offered and at what price. Price can be as low as $50/hr to as high as $20,000 and up per hour. And a high price doesn't even guarantee RBGFE+ service, although there would be a high expectation of off the chart service. Service is as variable as the type of providers you may find (white, hispanic, asian, indian, black, slim, chubby, fat, BBW, short, tall, etc). In this kind of business, it's BUYER BEWARE. You can't go to your local BBB if you have a complaint and you can't even go to the police if you feel the provider you just saw was a "ROB". What are you going to say, "I just saw a prostitute and she gave me really poor service"? It's a high risk activity for both you and the provider. The provider has to worry about LE, being robbed, being stiffed (not paid), STD, AIDs, assaulted, etc. You can probably figure out what risks the average hobbier has to contend with.
Sorry for the long winded response, but in this hobby, nothing is guaranteed or "set in stone". To find what you want and increase your chances of a positive outcome, remember this mantra ... Must do research ... Must do research ... Must do research ...
Or you could just TOFTT and see what happens. Don't forget to report back your findings.