Put two cups of water in the pan with the turkey. I rubbed 2 tablespoons of butter under the skin of the turkey. I shake some salt and pepper on top. Less is more. I don’t like to season a holiday turkey too much. There are going to be so many flavors on the dinner table.
Every 30 minutes you want to use a turkey baster or a ladle to scoop some of the liquid up from the bottom and pour it over the top. You don’t want the top of the turkey to dry out.
Using a oven bag you can skip this step.
On average the calculation for cooking a turkey is 15 minutes for every 1 pound.
15 minutes X 20 pounds = 300 minutes
300 minutes is 5 hours
Of course this is an average, my turkey was finished in 3 hours.
I dunno, checking it every half hours will ensure it won’t over cook.
Could you imagine if I had left it in the oven for 2 more hours. It would have dried out.