John Boyne books in order
12 books in the catalogue, about 74 hours of reading in all; the shortest takes 4 hours and the longest 13 hours.
12 standalone books in the catalogue.
Standalone books
Pied Piper 5.6 h 
The House of Special Purpose 7.9 h 
The Boy in the Striped Pyjamas 4.0 h 
Noah Barleywater Runs Away 4.1 h 
The Absolutist 5.9 h 
The Terrible Thing That Happened to Barnaby Brocket 4.8 h 
Stay Where You Are and Then Leave 4.7 h 
This House Is Haunted 5.5 h 
The Boy at the Top of the Mountain 4.7 h 
The Heart's Invisible Furies 12.6 h 
A Ladder to the Sky 7.3 h 
All the Broken Places 6.8 h