Books like Positive Psychology
Kate Hefferon
Positive Psychology is 1,157 pages, about 21 hours 13 minutes at 250 words a minute.
6 books to read next
How long each takes
The Happiness Advantage 4.7 h 
Authentic Happiness 6.2 h 
The How of Happiness 6.7 h 
Flourish 7.0 h 
The Antidote 4.7 h 
The Science and Application of Positive Psychology 8.1 h Bar height shows length. Estimated at 250 words a minute.