Three months:
You must:
have spent at least one day in the last five years lawfully in Australia
have spent less than two years in the last five years in Australia
have been a permanent resident or an Australian citizen for the entire period spent in Australia
provide evidence that there is a compelling and compassionate reason for your departure.
If you have been outside Australia for more than three continuous months immediately before making the application, you must also show that there is a compelling and compassionate reason for the absence.
Maximum one year:
If you do not meet the requirements above you may be eligible for a Resident Return visa if you are the partner or dependent family member of a Resident Return visa holder.
If this is your situation, you can only be granted a visa for up to one year and the period granted cannot exceed the time remaining on your family member's visa.