Question: how long does it take to cook a thawed out turkey?
Answer: Here's our calculation: If a thawed bird requires 15 to 20 minutes per pound at 325°F then a 20-pound thawed turkey would take about 5 to 6 1/2 hours, plus 50%, which means 2 1/2 to 3 hours more. That's 7 1/2 to 9 1/2 hours to cook a completely frozen 20-pound turkey.