How long can it be published after applying for a patent?

Legal analysis: the longest examination and authorization time of invention patent is about 30 months, utility model is about 10 months, and design is about 6 months. According to the laws of our country, after receiving an application for a patent for invention, the patent administrative department of the State Council, after preliminary examination, considers that it conforms to the provisions of this law, and shall publish it after 18 months from the date of application.

Legal basis: Article 34 of the Patent Law of People's Republic of China (PRC). After receiving an application for a patent for invention, the administrative department for patent in the State Council, after preliminary examination, finds that it conforms to the provisions of this Law, and shall publish it within 18 months from the date of application. The patent administration department of the State Council may publish its application at an early date upon the request of the applicant.