It is based on the length of time:
- you have lawfully lived in Australia
- you have spent outside Australia
- you have been a permanent resident
- You must have been living in Australia on a valid Australian visa for 4 years immediately before applying, including 1 year as a permanent resident, and
- You must not have been absent from Australia for more than 1 year during the 4 year period, including no more than 90 days in the year immediately before applying.