The first thing you need to do is to soak the herbs in cold water for about half an hour, and then start stewing them for 10-15 minutes after half an hour, and then switch to slow stewing for 10-15 minutes after the herbs inside the pot have boiled, for a total of 25-40 minutes. In general, the stewing time for heat-clearing drugs can be shortened to about 15 minutes. If it is a tonic Chinese medicine, it needs to be stewed for a longer time, up to 40 minutes. If there are some mineral-based herbs, they have to be put down first and decocted for half an hour first.