Nine Stories
A Salinger fan claims to have read 'Nine Stories' in every order: 9! = 362,880 times.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2019-02-18-nine-stories/ (CC BY-NC 4.0)Transcript
A: "Oh my gosh, I love J.D. Salinger! I must have reread that book so many times that I've experienced every permutation of the stories."
B (holding "9 Stories"): "You've read this book 362,880 times?"
A: "Now I can finally start rereading my favorite orders."