One day to six months. According to Query 39 Health Network, tremella can only be stored for one day at room temperature, because the nutrients in tremella are easily oxidized at high temperature, which leads to the deterioration of tremella soup. Tremella can be stored in the cold storage for three days, but it should be noted that tremella should be sealed in the cold storage to prevent bacteria from entering. Tremella can be refrigerated for half a year, but it should be noted that tremella can be refrigerated.