Generally, the time it takes to oven bake a sweet potato depends on the size of the sweet potato and the temperature of the oven. It is usually recommended to bake at around 200 degrees, and depending on the size of the sweet potato, the time can range from 30 minutes to 1 hour. The following is an approximate baking time reference:

Sweet potatoes 3-5 centimeters in diameter, bake for about 25-35 minutes;

Sweet potatoes 5-7 centimeters in diameter, bake for about 40-50 minutes;

Sweet potatoes 7-10 centimeters in diameter, bake for about 60-80 minutes.

When the oven reaches the preset temperature, arrange the washed sweet potatoes evenly on the middle baking sheet and place them in the oven, turning them every 15-20 minutes to ensure that the sweet potatoes are heated evenly. A toothpick or bamboo skewer can be inserted inside the sweet potato during baking; if it penetrates easily, it is cooked through.

It should be noted that the texture and baking time may vary for different varieties of sweet potatoes.