Books like How to Break a Dragon's Heart
Cressida Cowell
How to Break a Dragon's Heart is 320 pages, about 5 hours 52 minutes at 250 words a minute.
12 books to read next
How long each takes
Attack of the Dragons 2.2 h 
How to Train Your Dragon 1.2 h 
The Mysterious Message 2.4 h 
The Dragonet Prophecy 5.9 h 
The Hidden Kingdom 5.7 h 
Dog Man 4.4 h 
Darkstalker 6.7 h 
How to Train Your Dragon 32 min 
The Hidden Kingdom 6.2 h 
Talons of Power 6.2 h 
Bone 4.3 h 
The Dark Secret 5.5 h Bar height shows length. Estimated at 250 words a minute.