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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.
How long can you keep jello OUT of the fridge?   Foods that are left out in room temperature for more than an hour can begin bacteria growth. Our stomach acids can kill some of these bacterias but not all and some can â¦make you very sick. Keep foods OUT of the danger zone- Above 45 degrees and Below 145 degrees.