How did you stay on top of routine maintenance? What method did you use to track this, if any?
My armory is climate controlled and each of the weapons storage lockers are cleared and cleaned on a weekly rotational basis. Exceptions for things waxed and greased for long term storage.
Wall mounted weapons are dusted weekly and are wiped down with the rags used to oil and clean weapons after weekly range trips.
Decorative weapons are cleaned monthly aside from the weekly dusting.
How frequently did you shoot each and every item? Teaching firearms are taken out weekly, I rotate the historical stuff in when i feel like it, self defense stuff weekly, treasures yearly.
How long in between range sessions was too long making it time to part ways with something? - This isn’t a factor,I only get rid of self defense stuff as new technology comes around.
How did you manage items you’re weren’t ready to sell, but no longer shot (e.g. specific long term methods to preserve)? I use wax and grease to store them.
Did you primarily have a collection comprised of one type of firearm (i.e. handgun, rifle, shotgun, etc) that was just supplemented with a select few pieces from another? - I started collecting around 24 or so, I am teleporting WWI and WWII relics thru history, I buy out of collections only the most rare and historical pieces. Other than that my armory has specific usage classifications, hunting for different environments and animals, defensive, offensive, historical.