Two packages can be prepared at once on the range top. Use double the amount of butter or oil, water, tomatoes or any other added ingredients listed in the directions for one box. Prepare according to the Range Top package directions. We do not recommend making more than one box in the microwave. The amount of water and product involved takes too long to come to a boil in the microwave, thus the results are not as good. We do not have specific recommendations for making 3 or more boxes. The amount of water may not be optimal if more than two boxes are prepared at a time. If the standard directions have just slightly too much water, 3 times the amount may be way too much.