Books like Astral Projection
Oliver Fox
Astral Projection is 160 pages, about 2 hours 56 minutes at 250 words a minute.
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Three Magic Words 5.8 h 
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The Art of Stillness 1.4 h 
Shamanism 10.9 h 
Kundalini 1.1 h Deepak Chopra 2.7 h Bar height shows length. Estimated at 250 words a minute.