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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.
haha I had a jello shots party a few weeks ago and made 300 shots!! haha. I like to add powerdered juice mix to make them extra flavoury! Okay but.....I would put them in the fridge for about......6 hours and that should do. It's not like doing a big thing of jello...rather it's lots of little ones...so they set faster than you would think. When we did the party...we ran out, so we had to make more!