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MPa, 3 min) ranch dressing during 2 wk of storage at 26 â¦C. Simi-. larly, no yeast colonies were recovered during the same storage pe-. riod from T. delbrueckii-inoculated dressing that was treated with. 400 or 600 MPa for 3 min; however, when ranch dressing was con-.
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.