I go to my University's library so often that my old roommate thought that all of my books on our shared book shelf weren't actually part of my collection, but were actually just library books.

I rarely finish them, though, sadly. When I do read a book I tend to finish it that day, but that's with novels. Anything non-fiction will almost certainly take me days to finish, and I'm always finding new books on topics that I think are really neat, but never have the time to finish.