Books like Quantum Questions
Ken Wilber
Quantum Questions is 225 pages, about 4 hours 8 minutes at 250 words a minute.
7 books to read next
How long each takes
The Tao of Physics 6.5 h 
The Holographic Universe 6.2 h 
The Physics of Immortality 9.7 h 
Mysticism and the New Physics 3.6 h 
The Mysticism of Sound and Music 5.9 h 
The Quantum and the Lotus 5.9 h 
Punk Science 5.9 h Bar height shows length. Estimated at 250 words a minute.