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2-4 Months. 12 Months. Of course, the shelf life of M&M's is shorter if they are not stored properly. But remember that M&M's, like a lot of other sweets, usually have a best before date and not an expiration date. Because of this distinction, you may safely use them even after their best before date has lapsed.
What a short duration is, and how it exactly impacts MRE shelf life, is anyoneâs guess. Chilling MREs in the fridge undoubtedly extends the shelf life of MREs, however it is not specified by how much. Some sites selling MREs claim they last as long as 130 months (almost 11 years) at 60 F (15 C) .