How long can I apply for a green card after I get married with an American?

once you get married, you can apply for immigration.

The application materials need to be very detailed, including the process of meeting, proposing marriage and so on. Mainly for face-to-face signing.

generally, it takes about one year from application to face-to-face signing.

If you pass the face-to-face visa, you can get a temporary green card after entering the country and apply for a permanent green card one year later. The inspection is really strict and you ask very personal questions.

during the period from the application for naturalization to the approval, continuous residence must be maintained. The application for naturalization can be made three months before your continuous residence time reaches three years. When you take the oath of naturalization, you must be in the United States.