As a solar oven, the quick answer is, "No. It will take longer."
However, on days when the UV index is low, solar cooking takes the longest time and on days when the UV index is near max, solar cooking will be the shortest time. Even at it shortest, it may even then take an hour longer than a regular oven would take. However, for the SunFocus and the UGLI 3-in-1 ovens, on the high electric setting, the cooking times can be very similar to your regular oven.