Sounds really confusing. Maybe they count arrival day as Day 1 not Day 0?These two points are irreconcilable - flights arrive all day and they hand out directions all day, so there is always a variance from 14 x 24 hour time periods. Qld Health will pay your taxi fare to the airport, but everyone else is on their own after release.
In Sydney we were ever so lucky that our flight reached that gate at 11:58 am. We were due in at 12:15. If we’d taken just 2 minutes longer during the taxi to the gate we would have had an extra 9 or 11 hrs in quarantine, instead of leaving at 7am like we did we would have had to stay until 4pm or 6pm ( I can’t remember if after midday arrivals departed 4-6pm or 6-8pm).
WA’s is by far the easiest to work out. Land at 3pm Monday. Leave at 3pm Monday. Kudos to them .