Books like The Devils of Loudun
Aldous Huxley, Matthew Lloyd Davies
The Devils of Loudun is 368 pages, about 6 hours 45 minutes at 250 words a minute.
6 books to read next
How long each takes
Pigs in the Parlor 3.1 h 
The Darkest Seduction 8.8 h 
Deliver Us from Evil 4.1 h 
The Devil in Connecticut 5.5 h Cronista All'inferno 5.5 h 
101 Questions and Answers on Demon Powers 2.9 h Bar height shows length. Estimated at 250 words a minute.