Books like Kundalini Yoga for the West
Radha Swami Sivananda
Kundalini Yoga for the West is 363 pages, about 6 hours 39 minutes at 250 words a minute.
6 books to read next
How long each takes
A Chakra & Kundalini Workbook 4.7 h 
Journey of Awakening 7.3 h 
Kundalini 2.1 h 
Kundalini for Beginners 6.0 h 
Kundalini--psychosis or Transcendence? 2.1 h 
Chakras 2.3 h Bar height shows length. Estimated at 250 words a minute.