Quality, not Quantity, IMHO
I totally agree with other brothers here who say it's important, and pono, we get the full hour we've paid for. However, that being said, for my money, I will be more pleased with a total horn-dog satisfying session that is so intense I am toast in 45 minutes and ready to walk out the door, verses a full hour that is just average whatevers. And I walk my talk on this one. My point being, quality of experience. Not a certain set number of minutes in the room. Is my bottom line every time.
Chiming in on time in room.
Too many relevant posts below to quote on this subject, so won't quote any. But I do agree with you mongers that want a full hour in the "rented room". However, most AMPs don't give a full 60 minutes, even though you paid for it. If you don't get it, then you can either complain to mama or short tip the girl. If they don't like that, they won't be letting you back in or the girl will refuse to see you, or she will demand payment upfront because she remembers that you short tipped her last time. You can take your business elsewhere, but there will be many mongers to take your place that WILL put up with the shorted time in the room with the provider, AS LONG AS the service was good. So I do agree most with the "quality over quantity" statement that someone else stated.
My theory personally is to just be cool with mama and the girl. If they short me slightly on time but the service made me smile, I'll overlook it, and still give the girl a full tip. If you continue to be cool and the provider actually starts to enjoy the business relationship the two of you have, your room time will get longer, and service will get better and better. However, if they short me on time AND the service was kinda shitty, I will short tip the girl (not by that much, I'm not a dick) knowing full well she will not want to see me again. And I don't give a fuck because I know full well I don't want to see her again either.
Sure a lot of other variables come into play here. For example if you walk in super drunk or high on weed or coke, and start acting rude or bossy, naturally the provider will hate being with you, and you will surely be shorted, both on time and service. That's on you. Anyway you guys get the picture I'm trying to paint.
In the end, as long as the girl provides pretty good service, I don't mind if my time is cut short (within reason).