A very long time. Longer than you probably have.
Takes 4 - 5days
The best way to remove rust from a chrome with bodywork is to take your car to an autobody shop. They are the best people that can remove rust from chrome.
Copper doesn't rust
If they are an alloy, they will eventually rust.
How long will it t take a quarter to rust in fresh water
a long time
It depends on the quality of the nail. If it is painted it Amy take long to rust. In general it may take a month or so for the nail to rust.
a week it take or two
50 years
5 months
Yes, kerosene can remove rust from iron. Just take a brush and apply kerosene on the rusted iron piece and allow it to penetrate, and wipe it off with a cloth, you can repeat this until rust is cleaned to the maxmum.
Cannot rust. No oxygen or water.