H2B visas are allowed for a term of up to 1 year, with renewals of up to two years possible. However, after the second extension, the foreign worker must leave the country for at least three months before applying for reentry as an H-2B non-immigrant. When it comes to this, reach out to a company that you can trust.
For just as much since there are some occasions where foreign employees spend time outside of the United States, interrupting the H-2B worker's permitted stay and falling outside of the three-year limit. The duration of the work certification can also be prolonged with just an extension. For this reason, it is wise to entrust your needs to someone who is an expert to this field.