Depending on the situation, the duration of hyperbaric oxygen chamber treatment varies. At present, the most important is routine treatment, such as rehabilitation after cerebral hemorrhage, cerebral infarction and traumatic brain injury, which is usually two hours. But when treating decompression sickness, it will be determined by the depth of the dive, which may take five hours. If treating gas poisoning, it takes about three hours at the right pressure. In addition to the treatment time, there is also the question of the duration of the treatment. If it is decompression sickness, a course of treatment is sufficient. If it is a rehabilitative, regular patient, several sessions may be necessary, depending on the course of treatment, and the treatment time will depend on the results of the treatment. The regular treatment time for hyperbaric oxygen is two hours, but the treatment also includes the time for pressurization and decompression, which should not be counted as part of the treatment volume, and the real time for oxygen intake may be about one hour.