To stay safe, sandwiches, salads, and other meals with perishable ingredients shouldn't be left at room temperature for more than 2 hours—max. Leftovers should also go back in the refrigerator within 2 hours.
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If the total time is: • Less than 2 hours, the food can be used or put back in the refrigerator for later use, • Between 2 and 4 hours, the food can still be used, but can't be put back in the refrigerator, and • 4 hours or longer, the food must be thrown out. 2-HOUR / 4-HOUR RULE.