It depends. In summer when the temperature is high, it can be stored for 6 hours. After 6 hours, jiaozi may smell, soft and shapeless. In winter, the temperature is low, and the reproduction speed of bacteria is slow, which can last about 12 hours at room temperature.

Tangyuan, also known as "Tangtuan" and "Floating Zi Yuan", is one of the representatives of Han traditional snacks. At the same time, it is also the most distinctive food in the traditional Lantern Festival in China, and it also expresses the yearning and expectation of the ancient people for a happy life. According to legend, Tangyuan originated in the Song Dynasty. At that time, a novel food appeared in Mingzhou (now Ningbo City, Zhejiang Province), that is, black sesame seeds and pork suet were used as stuffing, a little sugar was added, and glutinous rice flour was rubbed into a circle outside. After cooking, it tastes sweet and soft, with endless aftertaste. At the same time, glutinous rice balls symbolize family reunion, and eating glutinous rice balls also means family happiness and happy reunion in the New Year, so it is a must-have food for the Lantern Festival on the fifteenth day of the first month.