It is possible to extend this visa, but the extension is limited to a maximum of 6 months. The application for an extension (Form I-539 Application to Extend/Change Nonimmigrant Status) must be filed before the current authorized period of stay ends. The USCIS recommends that B-1 and B-2 visa holders apply 45 days before their stay expires. Similarly, it is also possible to renew B-category visas. Depending on the circumstances, an employee or visitor may qualify for renewal through the interview waiver process, which is faster and easier than the traditional renewal process.