Thank you Dan O. We discovered that the preheat feature of the beep sound when temp is reached does indeed work. We were just not patient enough. Thank you for responding. This is a really nice website, very useful!
If it's taking too long to preheat, make sure the broil element is also heating during the preheat phase. During preheat both bake and broil elements usually heat to get the oven up to temperature more quickly.