By now, you should have probably eaten the jam. It has been two and a half months. I hand it to you with a label: eat it like it’s abundant. How long does it take for jam to disappear? Depends on how much jam you eat. People are pretty variable with jam, you find. But this is no ordinary jam. I made it, from berries that are not common, and my jam has a reputation for being so delicious that it effectively re-litigates all jam for all time.