Fukushou snail is a common type of snail, which is popular among diners because of its delicious meat. However, Fukushou snails have a high number of internal parasites, which can be harmful to human health if not handled properly. In order to ensure that fukushu snails are cooked, it is generally recommended to cook them for 20 minutes. This is because parasites cannot survive at high temperatures, and after 20 minutes of boiling, the parasites can be effectively killed to ensure the safety of consumption.