We have to follow the reccomendations from the USDA ( United States Department of Agriculture ). Adam has to cook the turkey. The mass of a turkey is 7 kg. First we have to convert kg to pounds ( 1 kg = 2.2 pounds ): 7 * 2.2 = 15.6 pounds. In the USDA table for: 14 - 18 pounds cooking time is: 4 to 4.5 hours. Answer: Adam should cook the turkey 4 to 4.5 hours ( he has to start cooking at 13.00 ).