A month. According to the introduction of Xunyi Yaoyao. com, Sinisan is a harmonizing agent, which has the effects of harmonizing the liver and spleen, eliminating pathogenic factors and relieving depression, soothing the liver and spleen, and one month is a course of treatment. Sinisan comes from Treatise on Febrile Diseases and consists of Bupleurum, Radix Paeoniae Alba, Fructus Aurantii Immaturus and Radix Glycyrrhizae. Ni is a famous TCM doctor in modern China and an important promoter of TCM internationalization.