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Manufacturers universally tell you to refrigerate mayonnaise once opened, though, because it helps preserve the flavor. Warmth causes mayonnaise to break down after a while, and it gets to the point where it just tastes oily. Homemade mayonnaise, of course, is a different matter. With its use of raw eggs, it is highly perishable and should be consumed immediately or refrigerated and finished off very shortly.
Store Bought Mayonnaise. An open container of store bought mayonnaise will last between one and three months in the refrigerator. Sources vary widely on the shelf life of unopened, commercially-bottled mayonnaise stored in the pantry -- from one week to four months past the sell-by date.