The period of time a person can remain in the United States on a business visa (B-1) depends on their specific situation as well as the approval of the U.S. Customs and Border Protection officer. The standard duration for B-1 visa holders allows them to remain in the United States for up to six months. The duration of stay can be extended if the business activities need additional time but the extension request must occur before the original authorized period ends and the applicant must demonstrate why their continued presence remains necessary.