Books like Islands in the Sky
Arthur C. Clarke, Charles Carroll
Islands in the Sky is 190 pages, about 3 hours 29 minutes at 250 words a minute.
12 books to read next
How long each takes
The Bromeliad 9.3 h 
Wings 4.0 h 
On the Beach 5.6 h 
Have Spacesuit--Will Travel 4.7 h 
Tunnel in the Sky 5.0 h 
The Green Book 1.4 h 
The Mayflower Project 3.3 h 
Podkayne of Mars 3.8 h 
Starman Jones 4.8 h 
Six of Crows 9.4 h 
Pathfinder 9.4 h 
Only You Can Save Mankind 4.1 h Bar height shows length. Estimated at 250 words a minute.