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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.
Quick Answer. It takes approximately four hours for JELL-O to set. There are also ways to speed-set JELL-O to make it set faster. Speed-setting makes it soft-set in 30 minutes and relatively firm in approximately one and a half hours. Continue Reading.