Books like Guardians of Ga'Hoole, Book Four
Kathryn Lasky, Pamela Garelick
Guardians of Ga'Hoole, Book Four is 222 pages, about 4 hours 4 minutes at 250 words a minute.
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How long each takes
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Dawn 6.2 h 
Eragon 10.6 h 
Scrambled Eggs Super! 1.2 h 
Steelheart 7.6 h 
Oakleaf Bearers 5.0 h 
The Burning Bridge 5.1 h 
The People of Sparks 6.2 h 
A Grimm Warning 8.8 h Bar height shows length. Estimated at 250 words a minute.