Books like Essence of Ninjutsu
Masaaki Hatsumi
Essence of Ninjutsu is 182 pages, about 3 hours 20 minutes at 250 words a minute.
9 books to read next
How long each takes
Naruto 72 3.9 h 
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Iron Body Ninja 2.7 h 
Ninja Secrets of Invisibility 2.2 h 
Naruto 11 3.4 h 
Young Samurai 11.5 h 
Naruto 42 3.5 h Bar height shows length. Estimated at 250 words a minute.