For a 14-pound turkey roasted in a conventional oven at 325–350°F, plan on about 3 to 3.5 hours if it is unstuffed, or about 3.5 to 4 hours if it is stuffed. Always go by internal temperature rather than time: the turkey is done when the thickest part of the breast and thigh reach 165°F. A simple approach:

• Oven temperature: 325°F–350°F.
• Unstuffed 14 lb turkey: start checking around 2.5 hours; most birds finish between 3 and 3.5 hours.
• Stuffed 14 lb turkey: start checking around 3 hours; most finish between 3.5 and 4 hours.
• Let the turkey rest 20–30 minutes before carving so the juices redistribute.