David Jones remained perhaps the last (major) retailer to have no time limit on change of mind returns after Officeworks amended theirs to 30 days a few years ago.
However, it seems that purchases before 1 August 2019 can still be returned at any time, so unlike Officeworks, the new David Jones Returns Policy is not retrospective?
Not sure why you linked to that, when a change of mind return is an exception to any ACL rule
https://www.accc.gov.au/consumers/consumer-rights-guarantees…
30-60 days is ample time if you simply changed your mind