You must have your units really messed up because there's no way that's right. A GPU drawing 700W for 10s would be 1.9444 Wh or 0.0019444 kWh and that's if the GPU was only serving your image gen for the whole 10s which is unlikely, most of the time is probably queuing since even a much lower powered GPU in a desktop PC can generate the same image in well under 10s.