Like most of the clutch components, it only wears while the clutch is disengaged and the motor running. Keep your damm foot of the clutch pedal while driving and don't slip the clutch any more than absolutely necessary.
Seems to me that input shaft is spinning in the bushing pretty much all the time unless the clutch is pushed in. I might be having a brain fart. If your moving, the input shaft is turning.....
