how long before a green card holder can become a citizen?
But the spouses of US citizens need not wait for five years and they just need to remain in America as lawful residents for three years and meet the other requirements, to apply for US citizenship. A Green Card holder who is not a minor can file Form N-400, Application for Naturalization, to obtain US citizenship. Similarly, he must have become a permanent resident before five years and must have remained as a permanent resident in America for at least five long years.