Robert Venditti books in order
10 books in the catalogue, about 27 hours of reading in all; the shortest takes 2 hours and the longest 4 hours.
10 standalone books in the catalogue.
Standalone books
The Lightning Thief 2.4 h 
The Sea of Monsters The Graphic Novel 2.4 h 
The Titan's Curse The Graphic Novel 2.4 h 
The Lost Hero The Graphic Novel 3.5 h 
The Son of Neptune 2.9 h 
The Battle of the Labyrinth The Graphic Novel 2.9 h 
The Isle of the Lost 2.4 h 
The Last Olympian The Graphic Novel 2.4 h 
The Mark of Athena Graphic Novel 2.9 h The House of Hades Graphic Novel 2.9 h