Generally, the electric oven is 8 watts (single layer heating), 15 watts (upper and lower layers are heated together) and 21 watts (up and down rear heating+rear fan+rotary barbecue fork), and the electricity consumption per hour is about 1-2 degrees, depending on the model.
Roast duck is usually hung on a fork, and heated up and down together, and the small fire lasts about 2-3 minutes.