How long do the sealed packets of ketchup, mustard, and mayonnaise last? The ones given out in fast food restaurants.
I put my surplus in the fridge and just noticed none of them have an expiration date.
Cleaning the kitchen after my mother passed away, I found condiment packets that were years
old. As far as I can tell, soy sauce is forever as long as it hasn't dried up. Somewhere around four or five years old, mustards and ketchup start turning dark in color. My mother undoubtably would have declared them perfectly edible, but I wasn't going to try them.
There weren't any mayonaise packets available to test, but jars of mayonaise are usually dated six months to a year in advance, and I've used mayo that was six months past the date and lived to tell the tale. I'd give the mayo packets two years, especially if they have been refrigerated instead of stuffed in a drawer.