How long is 20 minutes per pound?

Twenty minutes per pound means you have to cook the food for twenty minutes for each pound of weight. For instance, if you have a piece of food weighing 3 pounds, you'd have to cook it for 3 x 20 minutes, or 1 hour. If it weighed 4 pounds 4 ounces, that's 4 and a quarter pounds, so the time would be 4.25 x 20 minutes, which is 85 minutes or 1 hour 25 minutes.