In general, to obtain a visa it will take four business days. To get a visa in 2-3 business days you can apply for the Express Service (it costs an additional 20 USD); while to get a visa within one business day you can apply for Rush Service (which costs an additional 30 USD). Note that the Rush Service is granted only in documented cases of extreme urgency.
J visa holders subject to the two-year rule are not permitted to remain in the United States and apply for an adjustment/change of status to a prohibited nonimmigrant status (for example, from a J visa to an H visa) or to apply for legal permanent resident status (Green Card) without first returning home for two years or obtaining an approved waiver. Whether you are subject to the two-year rule is determined by a number of factors, including your source of funding and your country's "Skills List." It is not determined by the amount of time you spend in the United States.
The issuing authority may also require applicants to attest that they have no criminal convictions, or that they not participate in certain activities (like prostitution or drug trafficking). Some countries will deny visas if travellers' passports show evidence of citizenship of, or travel to, a country that is considered hostile by that country. For example, some Arabic-oriented countries will not issue visas to nationals of Israel and those whose passports bear evidence of visiting Israel.
Citizens of Canada and Mexico may be eligible for NAFTA Professional (TN) Nonimmigrant status if they work in a qualifying profession. TN status is very similar to H-1B status. To be eligible, you must have a higher education degree, or its equivalent, and a job offer from a U.S. employer. However, if you do not have a degree but have acquired similar skills after working for several years in a specialty occupation, you may also be eligible. Learn more about NAFTA work visas.

The Democratic People's Republic of Korea (North Korea) requires that its citizens obtain an exit visa stating the traveller's destination country and time to be spent abroad before leaving the country. Additionally, North Korean authorities also require North Korean citizens obtain a re-entry visa from a North Korean embassy or North Korean mission abroad before being allowed back into North Korea.

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