According to the Trademark Law, a registered trademark is valid for ten years, counting from the date of approval. You can renew it six months before the expiration of the validity period and pay the renewal fee. Each renewal is still valid for ten years. There is no limit to the number of renewals. If no application is made within this time limit, it can be extended for 6 months. If the registration is not renewed within the grace period, the Trademark Office will cancel its registered trademark and make an announcement. If you don't use it, you can also apply for cancellation, provided that you have registered, and cancellation is different. Revocation is generally illegal.