According to a large-scale statistical survey, a normal person can hold his breath for about half a minute to two minutes, and after strict scientific training, it can last for five to six minutes. But it doesn't mean that holding your breath for less than half a minute is unhealthy. It may just mean that he has poor tolerance for hypoxia and is also influenced by psychological factors. So how long he can hold back in one breath is inconclusive.
Practice method
The correct initial practice method is: take a deep breath first, breathe every bite until you can't breathe any more, and then breathe until you can't breathe any more. The whole process should be calm and uniform. It takes about 5 minutes until the brain is slightly dizzy or sleepy, and then this feeling disappears completely. At this time, you start to hold your breath and look at the time.
You will find that even for the first time, it is easy to hold your breath for 1.30 to 2 minutes. If you feel uncomfortable, such as holding your breath, or feeling a little dizzy, stop immediately and don't force it.
Just practice several times a day, but the interval is preferably 1 hour, which will soon increase to about 3 points. But if drowsiness and dizziness increase, don't practice any more to avoid brain hypoxia. And don't force yourself to extend the time or increase the amount of training.