Books like The Gate of Worlds
Robert Silverberg
The Gate of Worlds is 244 pages, about 4 hours 28 minutes at 250 words a minute.
12 books to read next
How long each takes
The Plot Against America 7.5 h 
Children of Dune 9.2 h 
Galápagos 5.4 h 
The Guns of the South 10.3 h 
Cloud Atlas 10.0 h 
Downbelow Station 7.9 h 
The Gods of Mars 3.7 h 
Windhaven 6.6 h 
Glory Road 5.3 h 
The Chessmen of Mars 4.3 h 
The Earthsea Quartet 12.9 h 
Radio Free Albemuth 4.7 h Bar height shows length. Estimated at 250 words a minute.