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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.
Freebase (0.00 / 0 votes) Rate this definition: Shelf life. Shelf life is the length of time that foods, beverages, pharmaceutical drugs, chemicals, and many other perishable items are given before they are considered unsuitable for sale, use, or consumption. In some regions, a best before, use by or freshness date is required on packaged perishable foods.