Own steamed oysters are generally whole shell oysters, whole shell oysters shells are harder, and fewer crevices can not be very good contact with the water vapor, the steaming time will be a little longer, but generally 7 minutes or so will be oysters open, the phenomenon, the oysters are just ripe, and if you like to be more cooked, you can extend the time to 10 minutes. At this time the oysters are just ripe, tender and juicy, if you like to cook some more, you can extend the time to 10 minutes.