Hello, I am happy to answer your question! The validity period of a power of attorney is generally ten years. The specific validity period depends on the actual use. If the trademark owner authorizes others to use the registered trademark, the authorization period is determined by negotiation between the trademark owner and the authorized person, and the authorization period generally cannot exceed the validity period of the trademark. The validity period of the power of attorney should be stipulated by the principal. If there is no period, it will be until the entrusted matter is completed.