3-4 minutes.

it takes 3-4 minutes to bake sweet potatoes in the electric oven. Wash and dry the sweet potato first, preheat the oven at 15 degrees for 5 minutes, then spread a layer of tin foil in the oven, open the oven at about 2 degrees, put it in for 2 minutes, turn it over and bake it for 1-2 minutes.