You don't have to spend money... Ugh.. I don't really have this kind of experience because I prefer the whole "I'm going to get to know you as a FRIEND first to see whether or not you're worthy of my time" (I actually say this--word for word--and it works like a charm). Take her to a bookstore, help her with her project. No money, you can talk while you're going at it, and it's a win-win for everybody. Furthermore, the "couple of hours" part gets eliminated. I would suggest leaving early anyway, for reasons related to attraction that are just too long to type.