I do not look at it in mumber of minutes but rather in the way I am treated and the way the provider makes me feel. When you spend time with a quality person the session will always seem to short but is usually longer than the time booked! Also what you get out of it depends on what you put into it.  Most of the time people will respond well to courtesy, respect, and and a genuine interest. Women are usually a lot more social then men and may like  the non business time.

some providers are clock watchers and hold genuine contempt for hobbyists.  other providers are "professional" - in other words, if you are having a great time chatting, they will give you subtle hints that its time to go (which a good hobbyist should listen to).  a very small number of providers will actually not watch the clock at all because they know you are a regular and they know you would never advertise on a discussion board or review "hey, you get two hours for the price of one".  i would simply point out to a new hobbyist (such as yourself) that a good business relationship with a provider grows out of seeing a provider a number of times and coming to a fair balance of expectations.  i have found that a provider who is comfortable with you wont mind spending an hour and a half for an hour paid if you are a regular, you never ask for a discount, or try to stretch the courtesy time even longer.

I agree that time means little. I will not go back if the provider says anything like "you have xx minutes left.". The only exception is if it is stated up front that another appointmens is scheduled behind me.

I have an ATF that I pay for an hour. SOmetimes it becomes 2 hours, other times 30 minutes. It all depends on the intensity of the session. We go until I am spent. That is my defination of a no rush session.