It takes my electric over a long time I think to
That is a long time, but please give more information on what type of oven you have, and how old it is if the following does not solve your problem. First, Make sure you have not covered the bottom of the oven with any type of barrier to keep the oven clean (aluminum foil or inserts), it blocks the vents. If it is an older convection oven, preheat on bake and set the convection after it has preheated. Check the elements. Lift up the bottom panel and do a visual check of the element. Take out the bottom panel and turn the on oven on somewhere near 450-500 degrees. Visually inspect the element and see if there are bright red areas and dull areas. If the element has red hot areas and dark areas, you need a new element. If the element does not get red at all, you need a new element. Electric ovens usually have an upper and lower element, so you should check both before replacing one. The broiler element should be visible without removing anything, just look at the top of the oven after you set to broil. Lastly, make sure the oven door shuts snugly and that any gasket around the door is in good condition. If you don't know if the door is tight enough, just lean up against it to see if it preheats more quickly. The oven also has a temperature sensor, but from your description, that would not be the case because you did not mention trouble maintaining the temperature.The good news is that elements are usually cheap and easy to replace. Try to find your owners manual, it will tell you what part you need. If not, write down as much info on your oven that you can and take the element with you to the parts store. If this is not helpful, leave comments with more information and I will attempt to solve your problem. thank you for your question.
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