It usually takes 2-3 months for a visa to be processed and issued, as the Swiss Embassy in your country is only responsible for receiving applications and interviews. The Swiss Embassy does not have the authority to process and grant a student visa. The visa application will be sent to the immigration office of the canton where the applicant is located (in this case, Zurich). The immigration office will review the full application and contact the school to verify candidate information. In some cases, the immigration officer may require additional documents from the candidate, in such cases the visa process will take longer.