Foreigners working for a foreign entity are allowed to visit the United States under a B-1 business visitor visa. This includes foreign nationals interested in visiting the United States for exploratory business purposes that do not involve receiving salary or payment. Persons admitted to the United States on a B-1 non-immigrant business visa are usually issued a 6-month stay. The maximum length of stay for visitor visa holders is 6 months. The immigration officer at the port of entry determines how long each visitor is allowed to stay in the country.