While this is certainly possible, I'm surprised to hear it. I thought my reading was progressing at the same pace but then noticed that I took a week to finish

While this is certainly possible, I'm surprised to hear it. I thought my reading was progressing at the same pace but then noticed that I took a week to finish a book that I'd otherwise finish in a few days. Perhaps your eyesight is better than mine and you are able to use a smaller font (which permits more content per 'page'). The problem for me is that legibility suffers at lower font sizes.