How do you cook a 36 pound turkey?

The rule of thumb for roasting an unstuffed turkey is to cook it for 15 minutes per pound at 325 degrees Fahrenheit. So for a 23 lb. turkey, you should expect it to cook for about 5 hours and 45 minutes. If it doesn't have a pop-up timer, start checking the temperature about and hour before your determined time is up and check it every 20 minutes until the temperature is 165 degrees F in the thickest areas of the thigh and breast.