Books like Over Sea, Under Stone
Susan Cooper
Over Sea, Under Stone is 252 pages, about 4 hours 37 minutes at 250 words a minute.
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How long each takes
The Neverending Story 7.8 h 
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The Austere Academy 4.3 h 
The Ersatz Elevator 4.8 h 
Max's Dragon Shirt 35 min 
A Summer to Die 2.8 h 
Ish 35 min 
Rave Master 3.2 h 
Jacob Have I Loved 4.0 h 
Judy Moody, M.D 2.9 h 
Slaves of the Mastery 6.9 h 
Becoming Naomi León 4.5 h Bar height shows length. Estimated at 250 words a minute.