Brett Helquist books in order
15 books in the catalogue, about 86 hours of reading in all; the shortest takes 44 minutes and the longest 18 hours.
15 standalone books in the catalogue.
Standalone books
The Reptile Room 3.5 h 
The Austere Academy 4.3 h 
The Wide Window 3.9 h 
The Ersatz Elevator 4.8 h 
The Hostile Hospital 4.8 h 
The Ominous Omnibus 9.1 h 
The Vile Village 4.7 h 
The Carnivorous Carnival 5.3 h 
The Slippery Slope 6.2 h 
Roger, the Jolly Pirate 44 min 
The Grim Grotto 5.9 h 
The Puzzling Puzzles 1.5 h 
The Penultimate Peril 6.5 h 
The Complete Wreck 18.3 h 
The End 6.8 h