Books like Piano for Dummies
Blake Neely
Piano for Dummies is 340 pages, about 6 hours 14 minutes at 250 words a minute.
6 books to read next
How long each takes
A Creative Approach to Music Fundamentals 6.8 h 
With Your Own Two Hands 5.4 h 
A Systematic Introduction to Improvisation on the Pianoforte 2.4 h 
The Jazz Piano Book 5.7 h 
Popular Piano Self-taught 2.2 h 
Playing the Piano for Pleasure 4.0 h Bar height shows length. Estimated at 250 words a minute.