Why is the application time of patent much shorter than that of trademark?

It takes nine months to register a trademark, from the submission of an application to the announcement, if there are no corrections or objections, but the actual situation is far more than this time. When applying for a patent, we will take the invention patent as the standard. After the application for a patent for invention is accepted, if it meets the requirements of the Patent Law after preliminary examination, it shall be published within 18 months from the date of application. If there are any notice corrections, application content defects, payment problems, etc. Will be published in two or three years.