Books like How to Be a Productivity Ninja
Graham Allcott
How to Be a Productivity Ninja is 343 pages, about 6 hours 17 minutes at 250 words a minute.
7 books to read next
How long each takes
The 80/20 Principle 5.2 h 
The Productivity Project 5.6 h 
Secrets of Productive People 5.3 h 
The Power of Less 3.5 h 
What The Most Successful People Do Before Breakfast How To Achieve More At Work And At Home 2.0 h 
The 80/20 Individual 4.7 h 
I Know How She Does It 5.7 h Bar height shows length. Estimated at 250 words a minute.