Ha, I checked out the ebook without realizing it was 800 pages, forgot about it until it was due back in three days, and started reading it. Two hours later I switched computers and got the 'you have 20% of the way into this book' notice and went "wait, how long is this-- oh...800 pages...yeah I'm not finishing this in three days."

And honestly didn't really feel disappointed because it was taking so long for all the characters to do anything! (And yeah I paused right around the time the one character who had a sense of humor died, heh.)