@Zmaluv,
Usually, I don't have the time to read a normal book of say 300 pages in less then 2 days.
Even if time wasn't an issue, I don't have the patience nor the reading ability to do so unless the book happened to be a really exciting YA (easy reading level) novel which I read on a rare occasion.
What kind of book are you talking about? Young adult novels for pleasure? An heavy academic work for school? If its the latter, take the time to read and mentally digest the book over a period of several days if not longer. Improperly reading an academic book filled with high and heavy content, you may miss out/gloss over some key points and ultimately the book's thesis.