faq
The period of validity of a visa relates only to the length of time during which the holder may travel to the United States and apply for admission at a port of entry. It does not determine the length of stay which is a matter decided by Customs and Border Protection (CBP) at the port of entry. If, while you are in the United States, you find that you need to stay there longer than the period of time initially granted to you, you must contact the nearest office of the United States Citizenship and Immigration Services (USCIS) to apply for an extension of your stay. The USCIS has sole jurisdiction over such matters
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