The U.S. B1/B2 visa duration varies based on the holder's nationality. Indian passport holders in Canada receive a visa that allows multiple entries across a 10-year period. The U.S. Customs and Border Protection (CBP) officer at the port of entry determines that each visit can have a maximum duration of 6 months. Before traveling you should check the visa sticker expiration date and maintain the duration specified on your I-94 record.