As a buyer of old, worn-out guns, love to change out the springs first thing,
(IF THEY SEEM WEAK or YOU GET A LOT OF MALFUNCTIONS)
as you never know what sort of storage/care its previously had...
after that, generally don't have to do it again until 30-40 years of hard use have passed
The other thing nobody mentioned...where you live.
Climate Change, of the wet kind, as in, do you live near a swamp/ocean/gulf??
That requires at least monthly oil-rag wipe-downs.
The closer you are to salt/swamp water, the more often mold/rust have to be prepped against.
Are you in an arid/desert climate?
Yearly wipedowns are fine...maybe even longer...
and of course, if you go thru a 2 weeks+ of rain, go oil 'em