The size and quantity of the snails, the cooking method, and the temperature and amount of water in the pot. If the snails are small or in small quantities, the cooking time can be shortened to about 10 minutes. Smaller or smaller quantities of snails will be heated to a fit state for consumption more quickly at higher temperatures. Larger snails or larger quantities should be cooked slightly longer to ensure that the interior is fully heated and becomes edible. About 15 minutes at medium heat will result in most snails of the right size becoming fully flavorful.