pretty sure they have to give minimum 7 days notice otherwise you can tell them to get farked.
We had an issue where an assessor was let into our rental property without our permission and no notification whatsoever. We only heard about it because the dog attacked him and they wanted to press charges.
REIWA were fucking useless in all this, had to get legal advice in the end.
3 Months later went the hard yards and bought our own place.
The only rentals worth renting are when your dealing with the owner directly. Most PM are scum.
PS Sorry if someone is a PM on here, Not aiming to tarnish all with the same brush just speaking from experience