What kind of service life was expected of the old damascus barreled double rifles before they shot loose?

For example, I have an Alex Henry double in 450-400 2 3/8” in very good condition with tight lockup and no discernable rifling wear, throat erosion or barrel pitting (I have a borescope)........I expect mine saw some occasional field carry based on the very light handling marks in the lumber, but it would appear this thing was a closet queen for the large majority of it’s 140+ year life, and rarely shot.

Of note, the lockup is a Jones underlever with no extra engineering trickery like side clips, Greener or Kersten crossbolts, or rising bites.

Back in the day, when these rifles were new, how many rounds would typically be shot before the rifle shot loose and/or needed restoration/repair given proper owner provided care and cleaning?