The duration of infusion therapy for bronchitis should be determined based on the pathogen causing the infection, the patient's constitution, and specific symptoms; generally, there is no fixed time frame. In normal cases, if immunity is normal, acute bronchitis can be treated with infusion therapy for about seven to ten days, and patients with mild symptoms can fully recover in three to five days. If the patient is frail, has low immunity, or if the medication is not effective against the pathogen, the course of the disease may be longer, requiring up to half a month or even more than twenty days. The specific duration should be decided based on clinical symptoms and the pathogen involved.