Books like The City of Ember
Jeanne DuPrau
The City of Ember is 270 pages, about 4 hours 57 minutes at 250 words a minute.
12 books to read next
How long each takes
The Invasion 3.5 h 
The Visitor 3.5 h 
InterWorld 4.4 h 
Harry Potter and the Cursed Child 6.3 h 
The Encounter 2.9 h 
The Search for Delicious 3.1 h 
Dragon's Nest 3.3 h 
The School for Good and Evil 9.1 h 
Prince Caspian 4.0 h 
The Princess Bride 7.3 h 
The Last Battle 3.5 h 
Redwall 6.5 h Bar height shows length. Estimated at 250 words a minute.