There is a new website that has just launched that has a very interesting premise. It will tell you how long it will take to read any book you search for.
When you search for a specific book from the pool of over 12 million titles it will provide you the sample text that publishers use to hype the book on Amazon. Once you found a book you are interested in reading there is a small button at the bottom of the page, which is the equivalent of a speed reading title. You simply click on the timer and based on the amount of time it takes you to read a few paragraphs of text it will approximate how long it will take to read the entire book.