We've been reading Magic Tree House books, and I've been reading 3-4 chapters a night. Those books are usually around 10 chapters or so it takes 2 or 3 nights to finish a book. I usually read another short book as well, and then have my son read me a book.

I thought that was pretty good, but my wife reads an entire chapter book in one night! I dunno if I can keep up with that...