Books like The Invisible Landscape
Terence McKenna
The Invisible Landscape is 236 pages, about 4 hours 20 minutes at 250 words a minute.
7 books to read next
How long each takes
Secrets of the I Ching 4.2 h 
Molecules of Emotion 6.8 h 
Anatomy of the Spirit 5.5 h 
Your Body Believes Every Word You Say 4.4 h 
The Seven Spiritual Laws of Yoga 4.1 h 
Shamanism 10.9 h 
Mending The Past And Healing The Future with Soul Retrieval 4.1 h Bar height shows length. Estimated at 250 words a minute.