Steve...whole turkeys that I have done are typically ready within 4 hours. I am doing a 12# this afternoon and expecting no more than 4 hours to reach 165IT. If your turkey is done too early for you, then lower the smoker temp to 140F and you can keep it in the smoker for an hour or so on "warm and hold". The other option is to remove and wrap and keep it in the oven if you don't need your oven today!