How much days does it take a quarter to rust?

The time it takes for a quarter to rust depends on environmental conditions such as humidity, moisture, and exposure to corrosive elements. Under typical conditions, a quarter, which is primarily made of copper and nickel, does not rust like iron; instead, it may tarnish or develop a patina. In highly corrosive environments, significant discoloration or corrosion could occur in a matter of days to weeks, but generally, it can take much longer for noticeable changes to appear.