How long does naturalization last?

The period of time between sending in the completed application Form N-400 and the interview to become a U.S. Citizen can vary from five months to more than two years, depending on where and when you choose to file your application.The swearing-in ceremony for receiving the naturalization certificate will then take place from 1 to 180 days after the interview, although in a few U.S. Citizenship and Immigration Services (USCIS, formerly known as the INS) district offices, it can take another one or two years.