A day or two.

Depending on the temperature and sunshine, it usually dries in one or two days. In winter, it will take longer, about three to four days. After drying, the cold skin has no moisture. It is easier to store it when it is hard. You can just soak it in warm water when eating. Moreover, the dried noodles will taste stronger and taste better than fresh ones. Compared with mung bean cold skin, the taste is richer.