It is completely normal for a residential kitchen oven to take between 30 and 60 minutes to cool down completely after operating at high temperatures like 400 degrees Fahrenheit. Because modern ovens are heavily insulated with dense fiberglass and built with thick porcelain-coated steel walls to retain thermal energy efficiently during baking, trapped heat inside the heavy cavity takes considerable time to dissipate through natural radiation and internal cooling ventilation fans. You can troubleshoot residual heat safely by letting the appliance cool naturally. You can verify normal appliance operation when observing that the internal temperature gradually declines over the hour following shutdown confirms that your heating elements have successfully turned off.
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