How long do coins take to wear down?
I am a long time lurker who has wondered, how long does it take a new coin to wear down from UNC to AU or XF or VG, etc? I assume a typical silver coin probably wore down to AU in a few months, and maybe took a year or so to hit XF, and maybe several years (on average) to get to F or VG, but has anyone actually researched this? An SLQ probably wore down quickly but a nickel coin would probably take longer. Gold probably wore down quickly but some gold was in a sack or pouch and didn’t get much wear compared to a gold coin in a pocket. Curious to hear what people think and have observed and thanks in advance!