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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 is milk good for after the sell-by date? By August 10, 2012. If you bring milk home from the store and open it on the sell-by date, it may be good for anywhere from two to five more days. That assumes you close the container in between uses, don't let it sit out at room temperature, and store it in the colder part of your refrigerator.