This whole subject is so subjective. I once had the same views as the author, i.e. read a lot, use your time to be as productive as possible. Now I take a much different view. For example I would advocate not "diving into a book world" while commuting but instead be aware of other people, watch them, listen to their talks and try to understand their situations. The same with his 100 pages a day: I think this is also very much arguable. For most mainstream books it seems smarter to just read the summaries, for more demanding literature rushing through them makes only sense if the mission is to "hunt" some specific information down. Reading less but thinking more(critical) about it makes in my option much more sense.