In general, the length of each person’s breath-holding time varies, good or bad lung function and there is no absolute time standard, normal people hold their breath for about 40 seconds. In general, the average person holding his breath time and physical condition, the surrounding environment, age, lung function and other factors, the average person can hold his breath for about 40 seconds, and for some people with chronic lung disease, obesity, lack of exercise, old people, holding their breath time is generally shorter than 40 seconds, long-term exercise in good physical condition of the population holding their breath time will be longer. Breath-holding time and lung function is not an absolute standard, longer breath-holding time can suggest that the lung ventilation is better, stronger lung function, under normal circumstances, breath-holding time of about 40 seconds is normal, the specific lung function can be assessed through the professional lung function examination.