Taking too long to preheat

Hi. I have attached the tech sheet for you. That does seem a little long for pre heating. Make sure the elements are coming on properly, that they are getting proper voltage, and there are no damaged or loose wiring. How is the door seal on the top oven? Is the door closing all the way? 500 deg is a very high temp and is going to take longer than usual to preheat, but if the bottom is preheating at 500 faster than the top their may be an issue. How long does it take for the bottom to preheat at 500? Normal preheat time can be 25-30 mins depending on the set temperature. How long does it take to preheat at a lower temperature such as 350?