Visitor and Tourist visas, or B-1/B-2 visas, usually permit people to visit the U.S. in six-month increments. Some tourist visas are valid for ten years at a time, while others are issued for shorter periods. Some people will arrive in the U.S. on a tourist visa and then change their mind, hoping to request a different immigration status for the future. At that time, it’s critical to consult with an expert immigration attorney to help you screen your case for possible hiccups or obstacles.