It takes 8 to 12 hours for most people to read the average book.
If you don't remember much from the book when you're done activating you need more questions and purpose. "Interest" is great for building curiosity. Why is it interesting, compared to what? Was the interesting stuff relevant to your purpose. If you don't remember much of it then it didn't satisfy your purpose.
Always do the prepare step first. Skip that one you may as well drop the book as well.
Alex
