Cook whole, unstuffed turkeys in oven cooking bags for roughly the following amounts of time at 350 °F:
8–12 lb turkeys should be cooked in 1 1/2–2 hours, 12–16 lb turkeys in 2–2 1/2 hours, 16–20 lb turkeys in 2–3 hours, and 20–24 lb turkeys in 3–3 1/2 hours.