I do not have enough information to provide a specific duration for medical treatment in Chengdu. The available data mentions a research study involving patients with chronic diseases conducted over a period from December 2023 to July 2025, but it does not specify standard treatment lengths for specific conditions. Additionally, while some high-end medical departments in the city require appointments three working days in advance and offer comprehensive follow-up services, the actual length of a treatment plan would depend entirely on the individual's medical needs and the specific healthcare facility. For general travel planning, most visitors spend 2 to 3 days in the city, and those entering for tourism or short-term visits can stay visa-free for up to 30 days. To provide a more accurate answer, please specify the type of medical treatment or the specific facility you are inquiring about.