The duration of respiratory use needs to be decided according to the situation, in the case of ICU invasive ventilation it needs to be used for a long time, in the case of home use it is usually 4 to 12 hours. The duration of respiratory use depends on the situation. In the case of invasive ventilation in the ICU, 24-hour non-stop use is required. Especially in some emergencies, where conditions for deconditioning may not be reached and blood oxygen plummets after deconditioning, which may be life-threatening, long-term use is required. However, if it is for home use, such as the treatment of sleep apnea syndrome, chronic obstructive pulmonary disease, etc., it is necessary to determine the use of respiratory time according to the primary disease and the severity of the disease, the general use of time within 4 to 12 hours. If the time is too short, the therapeutic effect cannot be achieved, and if the time is too long, it is easy to produce dependence. Therefore, it is necessary to consult a doctor in time and use it according to the doctor’s instruction.