How much time does he spend every day to read them? I'm always impressed by people who tell me they read a book in a few days. I understand that one can learn to read faster, but for non-technical books this always lead me to be unable to clearly envision the world it is taking place in. Just like a narrated movie.
Even if I slow down I often can't remember the names and places in the book.
In two hours I might read about 50 pages. Far too slow to even stand a chance doing the same challenge he does.