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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.
This is commonly referred to as the shelf life of batteries. For NiMH batteries, the shelf life at room temperature is about 70 to 90 days (for those who are a bit more technical, take a look at the charge retention curve).