Pretend or remember when you lose a lure to under water rocks or branches. If you came back a year or 2 later with a mask and snorkel, the hook is still there. So unless a fish/turtle has some sort of acidic chemical that causes hooks to break down quicker i would say they dont rust out easily.
IMO
Maybe you need Myth buster to come show us the way on this one?
Cheers!