What would be the expected mileage of a set of front brake rotors? And the rear one come to think of it!
Assuming normal road uses.
It’s just I’ve never seen them need replacing due wear! I seen damaged ones and warped ones but never seen them less than the minimum thickness!
The rear will probably last you forever...the fronts depend on how you ride...type of pads etc...my Brembo 320mm disc has gone from 4.5mm to 4.2mm in roughly 35k miles on an m821 with pads being replaced every 7-9k miles