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it would rust in a week and a half.
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Nope. You can get rust in a barrel in a few hours.
Getting it out is hard work. I've a Lyman GPR that I bought used. It is a great shooter. BUT.....no matter what I do or how ever many patches I run, they never come out clean. Never.
The gun shoots great despite that - 1.5" at 100 yards with PRB. When I drop a bore light down the barrel, it looks nice and shiny. Run a patch down - comes out dirty. Go figure.
The tried and true way to remove rust from a barrel is to lap it with a lapping compound. This requires that you make a lead lap fitted to the bore.
There are others who know more about the process than I.
You could also try wrapping a bore brush with steel wool and coating that with a lapping compound. You have to be careful, though, not to damage the rifling.
Pete