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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.
up vote 3 down vote. Perishable food should not be left out more than 2 hours at room temperature (1 hour when the temperature is above 90 Â°F, 32.2 Â°C). From what I understand, it doesn't last in the backcountry. The recommended shelf-life for commercial mayonnaise, opened and inside the refrigerator, is two months.o one can tell you exactly how long it will last. It will usually last until you contaminate it with bacteria and medium for growth. Then it will spoil pretty rapidly, usually within hours at the wrong temp, days at a good one.