why in the world does it take 45-55 min. to preheat to 425-450? It took a group message in my building for all of us to figure out that we were all experiencing the same problem. It was suggested by a resident that we preheat on convection and turn on the pre-heat booster. Also, do not like the fact that the microwave display does not match the same light intensity as the oven display when they're installed right next to each other.