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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.
There are ways to extend the shelf life of the MREs some. If you store them in an area that has a constant cool temperature that will extend the shelf life some (another year or two), but it will not be able to last 20 years the same way as other freeze-dried foods would. Hope this helps!