Books like Realm of the Reaper
K. A. Applegate
Realm of the Reaper is 173 pages, about 3 hours 10 minutes at 250 words a minute.
12 books to read next
How long each takes
Six of Crows 9.4 h 
Red Queen 8.1 h 
A Wizard of Earthsea 3.8 h 
Crooked Kingdom 10.7 h 
Defy Me 7.0 h 
Dragonflight 5.7 h 
The City of Ember 5.0 h 
The Ones Who Walk Away from Omelas 46 min 
Among the Hidden 2.9 h 
Dragonsong 3.6 h 
The Last Unicorn 4.6 h 
A Dangerous Path 6.2 h Bar height shows length. Estimated at 250 words a minute.