How long does it take to get married in China?

You need a green card before becoming an American citizen.

That is, after you get married, American citizens can apply for an immigrant visa for you, about one year.

After that, you will get a green card when you enter the United States. (Conditional green card and permanent green card)

Conditional green cards are for people who have been married for less than two years. You and your American spouse can't get divorced within these two years, otherwise the green card will be invalid. Before the conditional green card expires, you need your spouse to help you apply for a permanent green card.

And if you have been married for more than two years when applying for a visa, you will get a permanent green card directly after entering the United States.

With a green card, you can apply for American citizenship after staying in the United States for three years. (Only for marriage immigration green cards, green cards obtained by other means need to wait for five years before applying for naturalization)