If you are visiting the United States on a B-2 Tourist Visa and you need time because of a genuine reason you can try to apply for an extension of stay using Form I-539. The B-2 Tourist Visa extension of stay is not easy to get. You have to be careful because many B-2 Tourist Visa extension applications are denied. This happens because of mistakes or people not understanding the rules, for the B-2 Tourist Visa extension of stay. This guide explains how to apply, when to apply