A two-year H2b visa is an annual, non-immigrant visa that allows for unlimited immigration to Australia.
The visa can be renewed if the applicant meets the minimum requirements.
The two-years are renewable.
Aussie visa expiry rules vary across the country.
In Victoria, there are strict rules about the number of years an Australian visa can last.
The maximum number of days an Australian may stay in Australia before being eligible for another visa is six months.
But in NSW, for example, the maximum number is one year, but the two-months can be extended.
A new law passed in April will allow for extensions of visa validity for those with children.
The Australian Government said the change would be made available to the new family members.
The changes will also allow parents to apply for a second visa if they wish to come to Australia with their children.
The legislation allows people to apply to renew their visas for a maximum of three years.
This means a four-year visa would be available to Australian citizens who are not already living in Australia.
A family member who is not currently resident in Australia may apply for the visa extension.
However, the Government has not said when an Australian citizen could apply for another Australian visa.
The change to the visa process is expected to mean visa expiries for people from other countries, such as Vietnam, may not be as frequent.