22 CFR 42.72 - Validity of visas.
(a) Period of validity. With the exception indicated herein, the period of validity of an immigrant visa shall not exceed six months, beginning with the date of issuance. Any visa issued to a child lawfully adopted by a U.S. citizen and spouse while such citizen is serving abroad in the U.S. Armed Forces, is employed abroad by the U.S. Government, or is temporarily abroad on business, however, shall be valid until such time, for a period not to exceed 3 years, as the adoptive citizen parent returns to the United States in the course of that parent's military service, U.S. Government employment, or business.
(b) Extension of period of validity. If the visa was originally issued for a period of validity less than the maximum authorized by paragraph (a) of this section, the consular officer may extend the validity of the visa up to but not exceeding the maximum period permitted. If an immigrant applies for an extension at a consular office other than the issuing office, the consular officer shall, unless the officer is satisfied beyond doubt that the alien is eligible for the extension, communicate with the issuing office to determine if there is any objection to an extension. In extending the period of validity, the officer shall make an appropriate notation on the visa of the new expiration date, sign the document with title indicated, and impress the seal of the office thereon.
(d) Age and marital status in relation to validity of certain immigrant visas. In accordance with § 42.64(b), the validity of a visa may not extend beyond a date sixty days prior to the expiration of the passport. The period of validity of a visa issued to an immigrant as a child shall not extend beyond the day immediately proceding the date on which the alien becomes 21 years of age. The consular officer shall warn an alien, when appropriate, that the alien will be admissible as such an immigrant only if unmarried and under 21 years of age at the time of application for admission at a U.S. port of entry. The consular officer shall also warn an alien issued a visa as a first or second preference immigrant as an unmarried son or daughter of a citizen or lawful permanent resident of the United States that the alien will be admissible as such an immigrant only if unmarried at the time of application for admission at a U.S. port of entry.