How long does it take for parents to apply for a green card and wait for a face-to-face visa after 26?

3-6 days. A green card, that is, a permanent residence permit for foreigners, is a permanent residence permit for foreign citizens. Holding a green card means that the cardholder has the permanent residence right in the issuing country. At the same time, holding a green card can exempt the entry visa for a certain period of time, and all the required materials, such as financial guarantee (relatives) and notarization, are submitted, and the letter will be signed face-to-face in 3-6 days, and the face-to-face period is 45 days after P4.