How long can I get the certificate after the patent is published?

It's hard to say. If there are no special circumstances, your patent conforms to the provisions of the patent law, and you can usually get a certificate within two years. Of course, if your application is creative, you may get the certificate within six months. Also, if you want to get the certificate quickly. Just reply to the notice quickly. Don't reply before the deadline, it will delay your time.