4
How bad could this be? This sort of thing is addictive? You know when you're playing a computer game and you just have to get that level right? And forget the fact that this repetition would be considered so inanely boring in any other task you can do in life. Because it's on a screen (or in this case a maddenly addictive book) the notion that you might just finish is a fallacy old folks like to believe is possible.
And when you finally flick over that last page, your body withered and your brain deliquiescing into a gibbering mess, those nice people at the door in white coats will understand that you can't be separated from your book.