Hair loss caused by kidney deficiency varies in treatment duration depending on the specific condition, severity, and individual constitution. Generally, if the condition is mild, it typically takes about 15-30 days of treatment to see effective improvements. However, in cases of severe kidney deficiency, treatment may need to extend between two to three months. Therefore, it is crucial to manage the condition promptly. Initial steps can include dietary adjustments for supplementation, while more severe cases may require timely medication for effective relief.