Books like The Ancient Engineers
L. Sprague De Camp
The Ancient Engineers is 416 pages, about 7 hours 38 minutes at 250 words a minute.
12 books to read next
How long each takes
The Beginnings of Western Science 8.4 h 
A History of Science 11.9 h 
The Perfectionists 7.3 h 
Red Sparrow 8.0 h 
The Russia House 7.9 h 
Agent Zigzag 6.8 h 
The Craft of Intelligence 5.1 h 
Double Cross 8.4 h 
My Silent War 4.3 h 
Washington's Spies 7.0 h 
Joe Country 6.5 h 
Spy 5.9 h Bar height shows length. Estimated at 250 words a minute.