The criteria for easing the restrictions should be when the community transmission is reduced to below a published level, NOT a timeframe.
It kinda slipped under the radar a couple of weeks ago in all the noise but the PM finally stated/ admitted that Australia's stated goal of "supression" actually means zero community transmission ie. if you expect the borders to open, the only permitted cases would be those in hotel quarantine, and you can expect the premiers will want to know exactly what that means in other jurisdictions going forward.
https://www.theguardian.com/australi...-transmissions
Most of the world would view this regime as eradication and an unreasonable goal. However, this is the standard Australian governments appear to have set. It's become apparent from Queensland's actions in relation to NSW that that's their interpretation, particularly in view of an upcoming election. Expect the borders to stay closed for a while.
Australia's states and territories might as well be 8 different countries now. It's remarkable to see states boasting of putting "tough" border policies in place against Australian citizens. "Stop the boats" seems to have become "Stop everyone". Crazy times.