I was thinking about this last night and how I'm glad I don't read so many books. It seems like it would be hard to internalize a lot of the story. I used to read a lot more, and can think fondly on many of the books I read but cannot recall most plot details etc. Taking time to read a book, a few weeks, gives you time to digest it and ponder some of what it's saying, and create some long term memories as well! Gorging yourself on hundreds of books a year is probably only marginally better than doing the same with TV shows.