How long to cook 40 pound turkey?

I have been roasting 40-45lb Turkeys for about 25 years. Believe it or not, the bigger the bird, the less you have to cook it.

I stuff the Turkey with a bread stuffing, and put lots of butter under the skin. Be prepared to put a tin foil tent on the bird because it will brown well be fore it's done. I put my turkey into a 350 degree oven at 8:00 am in a rack, in 2 aluminum foil pans, with a tin foil collar around the pan so all the Turkey juices end up in the pan. I turn it around 11:30 I turn it breast down, and then continue cooking another 2 1/2 hours. Take it out of the oven, turn it breast up, take out the stuffing, and let it rest at least 20 minutes before carving. I also take it's temp in the thigh. Total time is approx 6-7 hours total