Of course, some INS officers work more slowly than others, so an applicant should not become concerned if an interview take twenty or thirty minutes. The final interview is usually held as a group swearing-in ceremony. This is where the oath of allegiance is taken and the actual certificate of naturalization is given to the applicant. After the final hearing, the applicant is a United States citizen. If an in-person inquiry does not provide the applicant with the information needed, the applicant should contact his or her local Congressman for further action.
Congressmen are generally quite helpful in resolving naturalization problems.