The cook time for a 20 lb turkey is the amount of time it takes to cook a 20 lb turkey. This can vary depending on the cooking method used, but a general rule of thumb is to cook the turkey for 13-15 minutes per pound. So, a 20 lb turkey would take approximately 4 hours and 40 minutes to cook.
It is important to cook the turkey to the correct internal temperature to ensure that it is safe to eat. The internal temperature of the turkey should reach 165 degrees Fahrenheit in the thickest part of the thigh. Using a meat thermometer is the best way to check the internal temperature of the turkey.