How long the heating time is depends on the set firepower, the amount of food, whether the food is ice or normal temperature, and the different seasons. Generally, the heating is high fire, so there is no need to set fire. Pour the food into a ceramic bowl. A 2-inch bowl is almost 1.5 minutes-more than 2 minutes in winter. In summer, the temperature is almost one minute higher, which is delicious when it is hot. A 5-inch bowl takes about 3-5 minutes. You can heat it for a little less time first, but not too much, so it won't be too hot.