Books like Downward to the Earth
Robert Silverberg
Downward to the Earth is 190 pages, about 3 hours 29 minutes at 250 words a minute.
12 books to read next
How long each takes
Footfall 9.8 h 
Planet of the Damned 3.1 h 
Children of the Mind 7.0 h 
Dreamcatcher 13.5 h 
The End of All Things 7.0 h 
The Voyage of the Space Beagle 3.7 h 
Contact 7.9 h 
A Desolation Called Peace 9.1 h 
Agent to the Stars 6.4 h 
The Gripping Hand 7.5 h 
The Star Beast 3.8 h 
Death's End 13.3 h Bar height shows length. Estimated at 250 words a minute.