Books like The Mask of Cthulhu
August Derleth
The Mask of Cthulhu is 186 pages, about 3 hours 25 minutes at 250 words a minute.
12 books to read next
How long each takes
Works 5.8 h 
The Call of Cthulhu and Other Weird Stories 7.7 h 
Novels 7.5 h 
Desperation 11.3 h 
The Fall of the House of Usher 42 min 
The Stand 21.1 h 
The Dark Descent 13.8 h 
The Stepford Wives 2.9 h 
Prime Evil 7.0 h 
New Tales of the Cthulhu Mythos 5.6 h 
Darkness 8.6 h 
John Dies at the End 7.9 h Bar height shows length. Estimated at 250 words a minute.