You can travel to and from Australia as many times as you want while the travel facility on the visa is valid. If you want to leave and re-enter Australia after this time you will need to apply for another Resident Return visa to enter Australia as a permanent resident.
New Zealand citizens
If the travel facility on your permanent visa ends, you might be granted a Special Category visa (subclass 444) (SCV) when you enter Australia. It is therefore important that you keep the travel facility on your permanent visa valid. We suggest you tell the immigration officer at the border that you hold a permanent visa, even if the travel facility is valid.