Alright, so let's break down the cooking time for our 12 lb stuffed turkey. For the first 2 hours, you'll want to cook the turkey at 325°F, breast side up. Then, you'll flip it over, and cook for another 30-45 minutes, or until the internal temperature reaches 165°F.
turkey-cooking-time-chart | Turkey cooking times, Turkey cooking chart
But, here's the thing: every oven is different, and every turkey is different - it's like they have their own little personalities! So, make sure to check that temperature regularly, and don't be afraid to give it a little extra time if needed.
And, pro tip: use a meat thermometer to ensure your turkey is cooked to perfection - don't rely on those old-school methods, like checking the juices or the leg wiggle (yeah, that's a thing!)