While the process of obtaining a US work visa has remained relatively unchanged over the years, the US, like many other countries, has updated its policies in accordance with increased national security measures. Therefore, it's best to include extra time for processing in your plans; while some work visas are approved in a matter of weeks, others may take significantly longer. Factors contributing to the time it takes to receive your US work visa include the class of work visa you're applying for, whom you'll be working for and your country of origin.