I was reading a hefty tome for Book Club on my Kindle. However, I felt I wasn't making fast enough progress so switched to Audible. At the same chapter, the kindle says 51 minutes to go and Audible says 2 hours. I've got through more on Audible as I can listen in the car, when I'm tidying the kitchen etc but I'm surprised that there is such a difference. Has anyone else noticed this?