...or rather, back-of-stove life? I have a glass jar on the back of the stove that we drain bacon grease into. We use the fat later for frying and seasoning food. I started doing this last year. Grandma used to save bacon fat, but I don't recall if there was a 'use by' sort of date...we seem to scoop out the top 1/2 inch pretty frequently, but the stuff at the bottom is months old (maybe more than that, lol). Anyone know if bacon grease goes off / gets dangerous at any point? Thanks!