Books like When the Sky Fell
Rand Flem-Ath
When the Sky Fell is 179 pages, about 3 hours 17 minutes at 250 words a minute.
10 books to read next
How long each takes
Atlantis Found 10.0 h 
Deep Storm 7.9 h 
Marion Zimmer Bradley's Ancestors of Avalon 6.7 h 
They Found Atlantis 6.0 h 
The Lost Continent 5.7 h 
Taliesin 9.3 h 
Edgar Cayce on Atlantis 3.1 h 
The History of Atlantis 4.4 h 
Atlantis 9.0 h 
Masters of Atlantis 4.5 h Bar height shows length. Estimated at 250 words a minute.