I don’t understand the German visa time issue.

The German visa issued is valid for 3 months. The Alien Service should be aware that this visa is not a short-term stay in federal territory. It can be extended by 6 months at the Aliens Administration, with an indication that the university applicant is to enroll in the university within this period, or to take a language class to prepare for university studies, or a pre-university course.

Germany is currently divided into two types: Schengen visa and German visa:

Schengen visa: The 7 EU countries signed the "Schengen Visa Agreement" in the small town of Schengen, Luxembourg in June 1985. Schengen visa holders can travel to 15 agreement countries, including 13 EU countries: Austria, Belgium, Denmark, Finland, France, Germany, Italy, Greece, Luxembourg, the Netherlands, Portugal, Spain, Sweden, and 2 Iceland and Norway. Countries outside the EU. Schengen visa is a short-term visa, which is divided into two types: single or multiple valid entry and transit visa. The stay period is 90 days within six months.

German visas: Types include tourist, business, transit, family reunion, marriage, work and study abroad visas. According to the newly promulgated "Immigration Law" of Germany, German embassies and consulates abroad can independently issue short-term visas with a validity period of less than 90 days. Visas with a validity period of more than 90 days, such as family reunion and work visas, must be approved by the local foreigners administration in Germany. Issue an entry visa and apply to the bureau for family reunification or work-limited residence permit after arriving in Germany. To apply for a study abroad visa, you must first apply to the Overseas Students Appraisal Department of the Cultural Office of the German Embassy in China for academic qualification review (the condition is that you have a two-year university degree). You can then apply for an entry visa at the German Embassy or Consulate in China with the certificate from the review department and other materials. After arriving in Germany, you must present your university degree. Please submit your admission notice to the local foreign affairs bureau to apply for a study and residence permit. To apply for a marriage visa, you must present the marriage registration certificate and other materials issued by the civil affairs bureaus of various places in Germany. After going to Germany, you should first go through the marriage registration procedures, and use the marriage certificate to apply for the corresponding residence permit at the local foreigners bureau.