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To preheat to 400 takes about 6 minutes. Regardless of if the divider is in or not.
Sorry, there was a problem. Please try again later.Thanks for your interest in the NE58H9970WS Range. It's true that it takes less time to heat up the individual oven cavities due to their smaller size when the Flex Duo divider is inserted. However, there are several variables (such as starting temperature, room temperature, etc.) that cause the amount of time to vary, so I'm unable to tell you how long it will take to preheat either oven. - Ms. Samsung
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