Books like Dark Lord of Derkholm
Diana Wynne Jones
Dark Lord of Derkholm is 480 pages, about 8 hours 48 minutes at 250 words a minute.
12 books to read next
How long each takes
Harry Potter and the Cursed Child 6.3 h 
The School for Good and Evil 9.1 h 
The Last Battle 3.5 h 
The Silver Chair 4.0 h 
Pawn of Prophecy 5.0 h 
A Winglets Collection 2.6 h 
Graceling 7.7 h 
Lost Continent 6.2 h 
The Dark Is Rising 4.7 h 
The Black Cauldron 4.1 h 
The Iron Trial 5.6 h 
The Bone Witch 7.5 h Bar height shows length. Estimated at 250 words a minute.