Books like When the Tripods Came
John Christopher, Joe Burleson
When the Tripods Came is 156 pages, about 2 hours 52 minutes at 250 words a minute.
12 books to read next
How long each takes
The Dangerous Days of Daniel X 5.0 h 
Demons and Druids 4.8 h 
The Visitor 3.5 h 
Watch the Skies 5.3 h 
Little Fuzzy 2.8 h 
Stars Above 7.3 h 
Prisoner of the Ant People 2.1 h 
The Forgotten 3.0 h 
E.T., the Book of the Green Planet 4.5 h 
Six of Crows 9.4 h 
Space Case 6.5 h 
The Battle for WondLa 8.8 h Bar height shows length. Estimated at 250 words a minute.