Bochur 24 – I salute you. Aizehu chacham, halomeid mekall adam. If nothing else, you learn what you do not like, every time you go out with someone.
It is an important lesson in life to be able to spend somewhat large amounts of time with someone EVEN WHEN THERE IS NO TACHLIS, because you will encounter many people in your lifetime on job interviews, classes, you workday, etc. with whom you will not especially enjoy being. You still have to be able to carry on a conversation with many of them, and simply act civilly. Three hour dates are a good start for familiarizing you with one on one relationships that might possibly be uncomfortable. On the plus side, if you like the girl or boy, it is a nice amount of time getting to know them.