Books like The Urth of the New Sun
Gene Wolfe
The Urth of the New Sun is 372 pages, about 6 hours 49 minutes at 250 words a minute.
12 books to read next
How long each takes
Children of Dune 9.2 h 
Downbelow Station 7.9 h 
Windhaven 6.6 h 
Glory Road 5.3 h 
The Earthsea Quartet 12.9 h 
Lord Valentine's Castle 8.6 h 
Three Hearts and Three Lions 3.3 h 
Dinosaur Planet 3.7 h 
Time for the Stars 4.5 h 
Waldo and Magic, Inc 3.7 h 
The Girl Who Heard Dragons 6.5 h 
Dune Messiah 5.1 h Bar height shows length. Estimated at 250 words a minute.