John Gottman books in order
10 books in the catalogue, about 51 hours of reading in all; the shortest takes 4 hours and the longest 9 hours.
10 standalone books in the catalogue.
Standalone books
A Couple's Guide to Communication 4.0 h 
Why Marriages Succeed or Fail 4.4 h 
Raising an Emotionally Intelligent Child 4.4 h 
The Seven Principles for Making Marriage Work 5.3 h 
The Relationship Cure 6.0 h 
10 Ways to Save Your Marriage 5.3 h 
The Science of Trust 8.8 h 
What Makes Love Last? 5.2 h 
The Man's Guide to Women 3.9 h 
Eight Dates 4.1 h