If you ask the term of protection of an invention patent, the term of protection of an invention patent is 20 years from the date of application.
If you ask how long it will take to authorize an application for a patent for invention, the application for a patent for invention will go through five stages: acceptance, preliminary examination, publication, substantive examination and authorization/rejection. Generally, it takes at least 18 months to issue an application result (it takes at least 2 or 3 years to apply for an invention patent in China, if it is abroad).