Books like The Hidden Kingdom
Barry Deutsch
The Hidden Kingdom is 312 pages, about 5 hours 43 minutes at 250 words a minute.
12 books to read next
How long each takes
The Dragonet Prophecy 5.9 h 
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Moon Rising 7.1 h 
Darkness of Dragons 7.9 h 
The Dangerous Gift 6.2 h 
The Poison Jungle 6.2 h 
Lost Continent 6.2 h 
Ferno The Fire Dragon 1.7 h 
The Hive Queen 5.3 h 
The Quest for Paradise 5.9 h Bar height shows length. Estimated at 250 words a minute.