Depends on actual situation.

When soaking dry fungus, different water temperatures are used, so the time required is different. Generally, the best way to soak dry fungus is to soak it in cold water, but because the dry fungus loses a lot of water, , Cool soaking takes a certain amount of time, usually about 3-4 hours. This time allows the dried fungus to slowly absorb the water, so that it can better achieve the translucent state when it is fresh.

If you use hot water to soak dry fungus, the time is shorter than cold water. It usually only takes about 10-20 minutes, because the longer the hot water is used to soak dry fungus, the harder it is to soak dry fungus. The more nutrients are lost, not only will the nutrition be greatly reduced, but the taste will not be as fresh and tender as before. Therefore, it is generally recommended to soak the fungus in hot water for only about 15-20 minutes.