I'm a fast reader, and can read more than 5 books a week; last year, while on vacation, I read a 600pg book in one day (I really enjoyed it too
)
When I was younger I would force myself to finish a book I didn't like but I no longer do that; I have way too many books I want to read before I die to waste my time on
duds.
Also, my reading is very mood-driven so I'm always reading more than one book at a time.