I'm at Hull which is about an hour and a half/ two hours away from my hometown in N Yorks. This year though I have been on a placement year in London so I am like a 5 hour drive away and I have been pretty homesick, I think maybe's it's more a psychological thing that if I am feeling homesick I can't just pop home like I could at Hull though.
It depends how much of a homebird you are, I have friends who went all the way to Aberdeen or Brighton and I think the fact they went to far away meant they had to settle down as going home wasn't an option all the time.