Do you take breaks while reading a book? Or read it straight through? (And, by breaks, I don’t mean sleeping, eating and going to work; I mean putting it aside for a time while you read something else.)
One of the reasons why I can read a lot of books is that I don't read more than one book at a time. I know there's a lot of folks who "multi-read," tackling several books at a time. Personally, I prefer to concentrate on one book, then move on to the next once I'm done. Though I don't get mixed up with the characters or stories, it seems disrespectful to the author that I don't give it my full attention.
In that sense, I guess I treat books as I would a movie: sit down, be comfy and dedicate an hour or so for it.