@Kyresti I expect they probably last a good bit longer than your average butter (the jam is less of a problem, considering that jam is one of those foods that originated as a method of preserving food), but i would like to know just how long because we have a bad habit of forgetting we have certain food items until we have a craving for them only to be disappointed as it turns out they've accumulated mold while hiding in the back of the refrigerator
-F