Depending on your country, the duration of an E2 visa ranges between a year and five years. But an E2 visa can be granted for as little as 3 months.
If granted, the validity of your E2 visa varies depending on your country. All Treaty of Commerce member countries have an associated E2 visa validity period.
The duration of your E2 visa is also determined by the terms of the “reciprocity” agreement between your home country and the US government. The reciprocity period for a particular country determines the duration of your E2 visa.