From the current partner booklet.https://www.border.gov.au/Forms/Documents/1127.pdf
Permanent Partner visa (subclasses 100 and 801) For the grant of the permanent Partner visa (subclass 100 or 801), you can be either in or outsideAustralia. This is the case whether you lodged your original application in or outside Australia. In most cases, permanent residence cannot be granted less than 2 years from when you lodge yourapplication. You may, however, be granted a permanent visa without having to fulfil the usual two-yearwaiting period if:
at the time you apply, you have been in a partner relationship with your partner for 3 years or more, or 2 years or more if you and your partner have a dependent child of yourrelationship; or
your partner holds or held a permanent humanitarian visa and you were in the relationship beforethe visa was granted and this relationship was declared to the department at the time (applies tosubclass 100 visas only).