If you are late, you should immediately if d out from the booker and or the girl if you can still have the full hour or if that creates a problem for their schedule. Your fee doesn't change if you are late. Be respectful of other people's time.
If it is an outcall, the hour starts when she arrives regardless of whether she is on time or late. It includes time for her to shower and adjust makeup before she leaves. Don't be a jerk about that. She showed up at your door nice and fresh, so allow her to leave the same way.
Yes its a good thing to ask if you will be able to have all your time i supose but i would disagree on the fact that if your late you should take the time lost on you. I may not be an incall guy but as an outcall guy SPs being late is a "normal thing". 15 mins or less and i don't even "care" personally. As in it won't affect my review or whatever. I find this "normality" I also have read plenty of stories of guys going to incalls and having to wait in the parking place or in the lobby for the SP to be ready. So i think if an SP can make a client wait, a client can make an SP wait a bit as well. Im not talking 45 mins here but 10-15 mins. Sometimes traffic and such especially in MTL can be a bitch.
Personally i try to always be on time for everything in life, but it did happen (rarely) something occured and i was a bit late. One time i was going to a friend's place in laval and the taxi driver literraly just took the wrong road. He didn't charge me for his fuck up but it did meant i arrived late at my friend's place (i missed 2 fights on the card cause of this lol) I know some peoples would argue that the SP have to follow a schedule for her day and you don't, but something can happen out of your control. Anyway i guess one more reason why i prefer to joyces of outcall... less stress.
As for the time at the end, its usually 10 mins max. But a good SP won't stress if you have not cum and its 55min in the meeting when you finally does it. Its more about if your cuddling and chilling in bed, by the 10m left mark she will most likely get up to prepare herself. But its important to note there is agencies who promise you the full 60 mins with you as part of there "promotion". They even precise shower time etc is after your 60mins.
One thing i would agree with peoples is that expect 59 mins of sex is a bit extreme, and yes she could very well get tired of doing something at some point. I am a slow cummer as well double with a loud mouth lol. Can't really book 30 min as i would fear not having enough time. But even in those cases i usually have come by the 45m mark if the encounter goes the way i hope.
For me an ideal meeting is
1) She arrive
2) Chat for 5-6 min
3) 4-5 Mins max of preparation in bathroom (fresh up etc)
4) Sex start at 10m in, 15 at mox
5) 30-35 mins of good sex
6) 5-10 mins of post sex talk
7) Shower time for her
But its dangerous sometimes, when you have too much chemistry with a girl and talking seem fun, it happened to me to realize in shock that shit 20 mins have already pass and saying "i like to talk to you but we gotta start now..." LOL
And to finish i would say if providers pressure you to finish with 20 mins left on the clock its because there 1 SOG type of girls from backpage or such, just wanting to make you cum as fast as possible so they can send you off the fastest. A good provider in a good agency/indy will not pressure you and when your done will stay to cuddle/chat anyway.