Wow thanks for the detailed reply.
Looks like for Victoria, no hens can go for more than 24 hours without food.
I had a look at the Codes of Practice for Poultry in Western Australia (where I am), they have a similar policy for laying hens:
https://www.agric.wa.gov.au/sites/gateway/files/Code%20of%20Practice%20for%20Poultry%20in%20Western%20Australia_0.pdf
"9.1
Poultry, other than newly-hatched birds, must have
access to food at least once in each 24-hour period.
The complete withholding of food for longer periods is
not acceptable except in the case of broiler breeder birds
or layer pullets, where ‘skip-a-day’ feeding is an
acceptable industry practice for maintaining bird health
and productivity."
But apparently broiler chickens are denied food in a pattern for "productivity."
Very glad we don't have the 7-10 day denial of food like in the US.