The baking time of sweet potato in the oven depends on the size of sweet potato, which usually takes 20 minutes. It takes half an hour to forty minutes to turn the fire to 220 degrees. This is a medium-sized sweet potato. Increase or decrease the time according to the different needs of sweet potatoes. After half an hour, take out the sweet potato, turn it over, and let the sweet potato be heated evenly. Put it in and heat it for 20 minutes to half an hour, and the sweet potato will be completely cooked.