Depends on the provider.

You should look for reviews that say the provider is not a "clock watcher".  Do a search and you will find more info on this subject.  Sometimes you don't even get the full time that was agreed upon.  Part of it will have to do with your attitude.  IF you act like  an a$$, you can be expect to get booted out pretty quick!  If you overstay your time, it would be nice to leave her a tip.

Good luck!
kc

Technically, it's the provider's responsibility to watch the time. It is  considerate however to acknowledge the time as you approach the end of your scheduled session. You can then take your cue from the lady, if she says something to the effect of "don't worry about it" than you can relax and enjoy yourself without thinking that you are taking advantage of her. If the lady has another appointment scheduled and needs for you to go, she'll let you know.

BTW, as Karma mentioned,if the lady does allow you extra time, a tip would certainly be in order.

Although I don't think it is you responsibility, i think it is a good thing if you kind of know the time.  It's good that you set up a 2 hour session, much more relaxed atmosphere imo.

I have heard a few times from providers i know well that, the guy "didn't get the hint", "he wouldn't leave", "he kept talking".  I know every guy wouldn't mind staying longer than usual, but make sure not to be "that guy".

Definitely look for the hints that time is up, or she is ok that you stay a little while longer.  As soon as you hear something like "i had a lot of fun", "do you have a long drive" or something of that nature, make sure you leave soon.  Lots of providers talk and you don't want to have that reputation

Anyway, just my opinion and I hope you have a great time.  Just relaxe and have fun!