offer me something generous and i am happy to stay, especially if we are already having a great time.
i will admit, there are times i have been asked to stay (as in "you can stay if you want to") but without any offer of additional pay. i have left on those occasions, mostly because asking for more money is uncomfortable, and the client didnt offer.
chances are we will have sex again (and again, and maybe again), and well, without some offer i feel like my generosity is being taken advantage of. i will always leave in this situation, even if i wanna stay, because of this.
any longer session of time is always open to negotiation, IMO. especially if you are willing to show a girl a good time, and she is truly enjoying you...my weakness is a nice hotel room, room service/eating a nice meal in bed together, watching a little telly or porn in bed, and good conversation. a 2 hour booking can easily turn into 5 and 6 hours, or if its late, an overnight ...
i wont give a direct quote (it changes depending on the circumstance, and often how much sex i think we will have, compared to time spent chilling), but lets say, its far less then my advertised overnight rate.