Books like The Floating Opera
John Barth
The Floating Opera is 252 pages, about 4 hours 37 minutes at 250 words a minute.
6 books to read next
How long each takes
Seven Keys to Baldpate 4.7 h 
Oracle Night 4.6 h 
Galatea 2.2 6.1 h 
The Real Life of Sebastian Knight 3.8 h 
The Tremor of Forgery 5.0 h 
The Egyptian Cross Mystery 5.7 h Bar height shows length. Estimated at 250 words a minute.