Books like Discovering Your Personality Type
Don Richard Riso
Discovering Your Personality Type is 120 pages, about 2 hours 12 minutes at 250 words a minute.
10 books to read next
How long each takes
The Enneagram 7.2 h 
Gifts Differing 4.1 h 
Do What You Are 6.8 h 
The 16 Sixteen Personality Types 57 min 
The Road Back to You 4.4 h 
Applied Positive Psychology 4.8 h 
Type Talk at Work 7.3 h 
I'm Not Crazy, I'm Just Not You 3.5 h 
The Interpersonal Underworld 4.4 h 
The Four Tendencies 4.7 h Bar height shows length. Estimated at 250 words a minute.