A Stranger in a Strange Land,Robert Heinlein: I reread it roughly every two to three years so likely six or seven times
Hobbit/LOTR/Silmarillion, J.RR, Tolkien: Almost yearly rereads so 15+ times
A Spell for Chameleon, Piers Anthony: Read it six or seven times
Magician, Raymond E.Feist: Every few years at least six times
Neuromancer, William Gibson: I've bought nine copies cause i keep giving them away to people, I've read every copy I've ever bought
Ender's Game, Orson Scott Card: at least five times
ASOIAF, GRRM: AGOT six or seven, ASOS/ACOK/AFFC five, ADWD four times, ADOS likely never at this rate
Dune,Frank Herbert: six or seven times, Children/Messiah at least four times
Redwall, Brian Jacques: Not sure honestly, I first read it when i was around ten years old, I remember reading it twice that summer alone. it's gotta be in the range of 8-10
Books I feel like i must have read at least four times
The Hitchiker's Guide, Douglas Adams
1984, George Orwell
Jurassic Park, Michael Chrighton
Ice wind Dale Trilogy, R.A.Salvatore
The Books of Swords, Fred Saberhagen
Abhorsen, Garth Nix