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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.
Quick Answer. Mayonnaise does not have as long of a shelf-life as many people think, and should not be left out unrefrigerated for more than a couple of hours. Leftovers that have been refrigerated immediately after preparation can be eaten safely for 2 to 3 days. Continue Reading.