In a Ball Mill (particularly) the wear rate or wear life of Rubber depends much on the Ball Size/Diameter used in that mill.  The grinding media size which itself is much of a function of the ore/material P80 feed size into that mill.

The other primary and addition factor contributing to a mill rubber liner wear is the RPM at which you operate the mill at.

estimate rubber liner life

 

Comminution and Energy Consumption: By National Research Council (U.S.). Committee on Comminution and Energy Consumption