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UPI. MADISON, Wis., May 11â Commercial mayonnaise may have been unfairly labeled as a source of food spoilage during the warm months, according to a study by the Food Research Institute of the University of Wisconsin. The study found that mayonnaise in salads actually helped reduce spoilage.
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.