Depending on the size of your turkey, it will cook for a different amount of time. u003cemu003eAlwaysu003c/emu003e want to take its internal temperature before removing it from the oven.u003cbr/u003eu003cbr/u003eu003cstrongu003eThe general rule is 20 minutes per pound of a whole turkey. u003c/strongu003eThis is dependent on if its stuffed (because stuffed birds take longer to cook), and how your oven works. So... set the timer for the time that makes sense, math-wise, for you, and check your bird's temperature before you remove it from the oven.u003cbr/u003eu003cbr/u003eHere's an estimate of how long you can expect an unstuffed turkey to roast:u003cbr/u003eu003cbr/u003e8 lb. turkey: 325°F for 2 hours 45 minutes.u003cbr/u003e10 lb. turkey: 325°F for 3 hours 15 minutes.u003cbr/u003e12 lb. turkey: 325°F for 4 hours.u003cbr/u003e14 lb. turkey: 325°F for 4 hours 45 minutes hours.