Question: how long do you smoke a 20 pound turkey?
Answer: Smoke at 225 to 250 degrees F (110 to 120 degrees C) for 10 hours, or until internal temperature reaches 180 degrees F (80 degrees C) when measured in the thickest part of the thigh. Baste the bird every 1 to 2 hours with the juices from the bottom of the roasting pan.