How long does it take to apply for a visa in advance and how soon can you come down?

It varies by country and visa type. It can be said that it ranges from 3 to 30 days.

It takes 1-3 working days to apply for a visa to Southeast Asia.

It takes 5-7 working days to apply for a Japanese and Korean visa.

Visa for other Asian countries takes 7- 10 working days. Usually, it takes 5 working days to review European visas, but an appointment is required in advance. (The appointment period is 30 days long and 1-2 days short)

The results will be known within 0/working days of the US-Canada visa/KLOC, but you need to make an appointment for an interview one month in advance.

African visas take 7- 15 working days.

Egypt, South Africa, Tanzania and Kenya have shorter working days.

Visa is a kind of license issued by a government agency according to its own laws for foreigners applying for entry, exit or transit.

According to the principles of international law, any sovereign country has the right to decide whether to allow foreigners to enter or leave the country, and to issue visas, refuse to issue visas or announce the cancellation of visas already issued according to its own laws.

The visa is usually attached to the passport or other international travel documents held by the applicant. Under special circumstances, valid passports or other international travel documents can be written on a separate sheet. With the progress of science and technology, some countries began to issue electronic visas and biological visas, which greatly enhanced the anti-counterfeiting function of visas.

Visa plays an important role in checking and controlling entry-exit personnel, protecting national security and preventing illegal immigrants and criminals.

Passport is the holder's nationality and identity certificate, and visa is the permission certificate of a sovereign country to allow foreign citizens or their own citizens to enter, exit or transit.

Visas are generally endorsed on passports, some are endorsed on other travel documents instead of passports, and some are issued separately. For example, immigration visas in the United States and Canada are A4 paper, and Singapore also issues separate paper visas to foreigners. Generally speaking, a visa must be used at the same time as a passport to be valid.

References:

Visa- Baidu encyclopedia