Under US immigration law you are required to have 5 years continuous residence.
Absences for more than 1 year break the period of residence.
There are exceptions where your employment is for a US government body or corporation.
Here is the regulation:
INA act 316
Unless the exemption applies you must wait for five years of residence.
Absence from the United States for a continuous period of one year or more during the period for which continuous residence is required for admission to citizenship (whether preceding or subsequent to the filing of the application for naturalization) shall break the continuity of such residence except that in the case of a person who has been physically present and residing in the United States after being lawfully admitted for permanent residence for an uninterrupted period of at least one year and who thereafter, is employed by or under contract with the Government of the United States or an American institution of research recognized as such by the Attorney General, or is employed by an American firm or corporation engaged in whole or in part in the development of foreign trade and commerce of the United States, or a subsidiary thereof more than 50 per centum of whose stock is owned by an American firm or corporation, or is employed by a public international organization of which the United States is a member by treaty or statute and by which the alien was not employed until after being lawfully admitted for permanent residence, no period of absence from the United States shall break the continuity of residence if-
(1) prior to the beginning of such period of employment (whether such period begins before or after his departure from the United States), but prior to the expiration of one year of continuous absence from the United States, the person has established to the satisfaction of the Attorney General that his absence from the United States for such period is to be on behalf of such Government, or for the purpose of carrying on scientific research on behalf of such institution, or to be engaged in the dev elopment of such foreign trade and commerce or whose residence abroad is necessary to the protection of the property rights in such countries of such firm or corporation, or to be employed by a public international organization of which the United States is a member by treaty or statute and by which the alien was not employed until after being lawfully admitted for permanent residence; and
(2) such person proves to the satisfaction of the Attorney General that his absence from the United States for such period has been for such purpose.
The spouse and dependent unmarried sons and daughters who are members of the household of a person who qualifies for the benefits of this subsection shall also be entitled to such benefits during the period for which they were residing abroad as dependent members of the household of the person. "
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