Diet herbal medicine duration varies by goal: ① mild loss (3–5kg): 1 month, ② moderate (5–10kg): 2–3 months, ③ severe obesity (10kg+): 3–6 months, ④ post-target maintenance: 1 month. Most people target 3 months as the standard course. Continuous use beyond 6 months not recommended (rest period needed). Re-evaluation at 1-month intervals adjusts prescription. Maintenance can be done seasonally (twice a year).