Yes, it is completely normal for a standard residential kitchen oven to take between 15 and 20 minutes to fully preheat to a standard baking temperature like 350 or 400 degrees Fahrenheit. The preheating duration depends on the thermal mass of the heavy metal racks, thick porcelain walls, and the wattage of the bake and broil heating elements drawing electrical current. You can troubleshoot preheat delays easily by closing the door tightly. You can verify that your appliance is operating normally when observing that the digital display chimes or reaches your target set point within 20 minutes confirms that your heating elements are drawing full electrical power and working efficiently.
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