How long can American immigrants immigrate in the 1990s?

Does the subject want to ask, "How long did it take for American immigrants in the 1990s?" It will take five years. According to the immigration law query 1990, after obtaining permanent residency in the United States, you must live in the United States for five consecutive years. Within five years, you must not leave the United States for more than half a year. America is a country founded by immigrants. Initially, immigrants from Europe and other places established colonies in North America, and on this basis, the present United States was formed.