Books like The Shaping of Middle-Earth
J. R. R. Tolkien, Christopher Tolkien
The Shaping of Middle-Earth is 380 pages, about 6 hours 58 minutes at 250 words a minute.
12 books to read next
How long each takes
The Wood Beyond the World 2.6 h 
Phantastes 3.6 h 
Equal Rites 4.8 h 
The Discworld Companion 7.0 h 
Thief of Time 7.0 h 
The House on the Borderland 3.3 h 
When the Sleeper Awakes 5.1 h 
The People of the Mist 6.7 h 
The Last Man 7.8 h 
Minor Arcana 5.3 h 
The Lord of the Rings 2.6 h 
The Scar 11.7 h Bar height shows length. Estimated at 250 words a minute.