Most plays last for only a few minutes but when I finally closed the book on it, my stats page said I had logged around 6 days of playtime! (thevitalounge.net)
It's a great feature for anyone who's ever needed to make that judgment call regarding how many more pages to read before it's time to close the book for now. (macworld.com)
For closed book exams, I would spend this time making sure that I could recreate my rough outline from memory. (lawyerist.com)