An employee of Tupperware Brands stores airtight containers at the company's plant in Joue-les-Tours, France, in 2013. As soon as this year’s Thanksgiving Day spread hits the dinner table, an invisible clock begins to count down how long the food can remain safe to eat. Most experts give leftover turkey, stuffing, mashed potatoes and pie just a few days in the refrigerator before you’d risk discomfort and illness by consuming them.