Books like Gregor and the Marks of Secret
Suzanne Collins
Gregor and the Marks of Secret is 316 pages, about 5 hours 48 minutes at 250 words a minute.
12 books to read next
How long each takes
Seeing Redd 6.9 h 
Triss 7.1 h 
The Long Patrol 6.8 h 
The Cry of the Icemark 8.7 h 
The Kestrel 4.5 h 
The Battle for WondLa 8.8 h 
Eragon 10.6 h 
Charlotte's Web 3.4 h 
Alice's Adventures in Wonderland 2.5 h 
A Court of Frost and Starlight 4.8 h 
Six of Crows 9.4 h 
Circle of Heroes 6.2 h Bar height shows length. Estimated at 250 words a minute.