[Eljaro]

The TKO input shaft will only turn inside the pilot bearing when the clutch is disengaged, so wear here only happens when you are pressing the clutch.
The rest of the time the TKO input shaft is turning with the flywheel and the input shaft in not rotating inside the pilot bearing and thus not wearing.
If the pilot bearing wears off so fast (in most cars they last a lifetime) it might be that the clutch is slipping and the pilot bearing is doing an abnormal work supporting the rotating input shaft.