How long does it take to apply for American citizenship?

Legal residents can apply for American citizenship after holding a green card for five years. For immigrants who marry American citizens, it takes about three years from green card to American citizenship. A person who has obtained a residence permit as asylum may apply for naturalization four years after the date of obtaining the residence permit. To become American citizens, foreigners must first become permanent residents (green card holders). There are few requirements for permanent residents to apply for American citizenship. Applicants need to prove that they have lived in the United States for 30 months in five years. Similarly, a person who applies for American citizenship by marrying an American citizen needs to live in the United States within three years 18 months.