This depends on whether the pneumothorax is a simple pneumothorax or is complicated by other diseases. If there are no other lung diseases present and it is just a simple pneumothorax, then typically, drainage by tube for 5 to 7 days can lead to a complete recovery and cure. However, if there are complications such as emphysema, pulmonary heart disease, pneumoconiosis, or lung infections, then it is necessary first to control the infections. During this time, the pneumothorax can easily become a communicating pneumothorax. If it lasts for more than 1 to 2 weeks, it may turn into a refractory pneumothorax. In the case of refractory pneumothorax, besides drainage, minimally invasive surgeries such as pleurodesis or pneumothorax occlusion procedures are required. These surgeries take time. Therefore, if a stubborn pneumothorax forms, especially when complications like emphysema are present, hospital stays often need to be 14 days or even longer.