Books like Brain Power
Marilyn Vos Savant
Brain Power is 250 pages, about 4 hours 35 minutes at 250 words a minute.
7 books to read next
How long each takes
The Silva Mind Control Method 4.4 h 
Discipline Equals Freedom 4.2 h 
13 Things Mentally Strong People Don't Do 5.1 h 
The Master Key System in Twenty-four Parts with Questionnaire and Glossary 3.8 h 
Use Your Head 2.9 h 
The Silva Mind Control Method of Mental Dynamics 4.6 h 
The Mind Gym 6.2 h Bar height shows length. Estimated at 250 words a minute.