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According to the Food Network, 1/3 to 1/2 pound of potatoes should be allocated per person when preparing mashed potatoes. When serving roasted potatoes, 2 1/2 pounds of potatoes should be allocated per person.
1 How long do mashed potatoes and other cooked potatoes last at room temperature? Bacteria grow rapidly at temperatures between 40 Â°F and 140 Â°F; cooked potatoes should be discarded if left for more than 2 hours at room temperature.  How to tell if mashed potatoes or other cooked potatoes are bad?