Jiuyang purple clay pot usually takes 70 minutes to two and a half hours to work. The high, heat preservation and automatic gears you use are mechanical purple sand without reservation function. This automatic gear only automatically adjusts the power. First, it is boiled with high power, and then it is automatically switched to a low-power cooker when it is almost cooked. There is no automatic power-off function until it is dry-burned, so this happens. It's best to use the one with reservation function, set a time before going to bed at night, predict when the meal is suitable, and adjust the time to 2.5 hours before the meal time, and then you can eat directly after you get up.