It's cold. How long can mushrooms be kept in foam boxes?

In cold weather, mushroom bags can be placed in foam boxes for 36-72 hours. The heat preservation time of foam incubator is 18-24 hours in summer and 36-72 hours in winter. If there is no ice or other auxiliary materials to maintain the low temperature, it is impossible to maintain the low temperature environment for a long time, and it will deteriorate for a long time.