Books like The Ultimate Guide to Kink
Tristan Taormino
The Ultimate Guide to Kink is 445 pages, about 8 hours 10 minutes at 250 words a minute.
7 books to read next
How long each takes
The Story of O 3.7 h 
Venus in Furs 3.7 h 
The Dark Garden 5.6 h 
Sensuous Magic 3.4 h 
Sex Tips from a Dominatrix 4.1 h 
Thinking Kink 4.2 h 
Sexual Outsiders 3.0 h Bar height shows length. Estimated at 250 words a minute.