Question: how long to cook a pork loin at 200 degrees?
Answer: Check the temperature throughout cooking, a wireless digital thermometer makes this really easy. Once the pork loin has reached 200 degrees, shut off the oven and let the pork loin roast cool for an hour before removing from the oven. Cooking Time: 2 1/2 hours per pound, or 5 hours for a 2 lb pork loin roast.