2. According to the size of the snail, the medium snail can be cooked for 5 to 6 minutes, and the slightly larger snail should not exceed 10 minute. After the water is boiled, add the snails and cook over high fire. Boiled snails are actually very particular. If you want boiled snails to be crisp and tender, you must control the time. If cooked for a short time, it will smell like fish, but if cooked for a long time, it will become stiff.