How long do you cook a 9 pound turkey at 400 degrees?

Cooking time may vary depending on the exact temperature of the oven and the specific bird, but as a general guide, a 9-pound turkey will take approximately 3 hours and 30 minutes to cook at 400 degrees Fahrenheit. It is always advisable to use a meat thermometer to ensure that the internal temperature of the turkey has reached a safe 165 degrees Fahrenheit before removing it from the oven.