What if your turkey must cook for 5 12 hours. you want to eat at 4 00 it will take 15 minutes to carve the the turkey at what time must the turkey go into the oven?

Example; a 15 lb turkey roasted for 20 minutes per pound = 300 minutes. Divide 300 minutes by 60 to get to hours. That equals 5 hours cooking time. Put the turkey in at 9 am. (actually, a little earlier to allow yourself time to get the table set and foodstuffs plated.)