Roasting Takes Hours
One way to cook a 10-lb. turkey is to roast it in the oven. The USDA recommends that you use an oven that is heated to at least 325 degrees Fahrenheit. At that temperature, a 10-lb. turkey will take about three hours to cook if it is thawed first. A frozen turkey may take about 4.5 hours to cook through. The turkey is safe to eat when it reaches a temperature of 165 degrees, according to the USDA.
Deep-Frying Is Faster
Deep-frying a turkey is a popular way to cook the bird in the southern United States. The cook submerges a seasoned turkey into a large stockpot or specially designed turkey fryer that is filled with cooking oil. According to chef Paula Deen, deep-frying a completely-thawed 10-pound turkey takes about 35 minutes.
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The internal temperature of the turkey should determine when it is done cooking, not the length of time that has passed. While turkeys generally cook in a set amount of time, this can vary widely based on the temperature of the heating element and the method used to prepare the bird.