So much depends on chemistry, which neither of you will know for sure until you have spent some time alone together. Some guys who have said that they can't do longtime may decide that it's fun together and stay longer, while others who have said that they will stay overnight find a sudden pressing need to leave, even if it reduces their fee.
It reminds me of the story long ago of a not particularly nice man who I met who said that the guy he was offing was very thoughtful because he slept on the floor at night so that the customer could be comfortable in the bed. Knowing the guy I talked to him a few days later and he told me that because of the unpleasant smell of the customer he couldn't sleep in the bed with him, and he could only do overnight if he slept on the floor!