The leader of Finnish Center Party, Paavo Väyrynen, once bragged that he had read all the works of Leo Tolstoy in three days, and got ridiculed. (War and Peace alone is 1500 pages!)

I have not even bought the HP6 yet (waiting for the main st[r]eam pass), but when I do, I will take my time reading it. I think it depends on the book, some you just read fast and some not, and you'll never know, what happens (unless you read the spoilers here! ;p)