Thirty minutes. According to the instruction manual of Sun Quan's Aimei medicated bag, Sun Quan's Aimei medicated bag is a traditional Chinese medicine preparation, which is mainly composed of Chinese herbal medicines such as Folium Artemisiae Argyi, and has the functions of warming meridians, eliminating dampness and relieving pain, and promoting blood circulation. The medicine bag needs to be applied for 30 minutes at a time. When using Sun Quan's Amy bag, you should pay attention to keep your skin clean and dry, and avoid using it when there are wounds, itching, redness and eczema.