8 to 30 minutes. How long it takes for a sweet potato to be cooked thoroughly depends on its size. Small sweet potatoes can be steamed in a steamer for 8 to 10 minutes. Larger sweet potatoes need to be steamed in a steamer for 20 to 30 minutes before they are ripe.

Sweet potato contains a lot of starch, which is not easy to steam. It can also be steamed in a pressure cooker, because the sweet potato steamed in the pressure cooker tastes good and can keep the sweetness of sweet potato well. Don't open it directly after steaming, stew it in the pot for a few minutes to ensure that the sweet potato center is cooked thoroughly. Finally poke it with chopsticks. If you don't use pimples, steam them.