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How Long Does Jello Last? Jello - How long does Jello Last? An unopened box of Jello gelatin can last indefinitely, whereas prepared Jello will only last about a week. The shelf life of jello can vary due to the type, packaging, storage method, and thickening agent used. Jello is typically created by adding boiling water to a powdered mix or purchased in ready made serving containers.
It's good for longer then an hour. They say that in the back of the directions because they want u to use more formula. It can be good for up to 3 hours. But if ur not sure then what I use is a formula jug and only poor what I think my little guy is going to eat. The formula jug in the fridge is good for 24 hours. I love it. Also making it a head of time brings down the bubbles in the formula.