移民大法師的答案錯誤！！

你在回美國後用四年加一天的 rule - 也就是回來待上四年加一天就能申請公民。

(ii) For period in excess of one (1) year. Unless an applicant applies for benefits in accordance with Sec. 316.5(d) , absences from the United States for a continuous period of one (1) year or more during the period for which continuous residence is required under Sec. 316.2(a)(3) and (a)(5) shall disrupt the continuity of the applicant's residence. An applicant described in this paragraph who must satisfy a five-year statutory residence period may file an application for naturalization four years and one day following the date of the applicant's return to the United States to resume permanent residence. An applicant described in this paragraph who must satisfy a three-year statutory residence period may file an application for naturalization two years and one day following the date of the applicant's return to the United States to resume permanent residence. (Amended 9/24/93; 58 FR 49913)