If the dumplings are frozen in the refrigerator, the time can be a little longer, about 10 minutes is already enough.
People usually wait until the water is boiling before putting the dumplings down, but in fact, you can cook the dumplings directly in cold water, which not only takes less time and saves gas, but also saves the skin of the dumplings from boiling. The only way to do this is to use cold water to cook the dumplings directly, which is limited to frozen dumplings.