You're correct, there are optimal times (and days) to post. I wrote a humorous article about it a couple of years ago and like to have fun with my friends who live in those states. It also depends on who you're trying to reach as USA vs Australia might have very different results.
I assume AUS like US has most of their population on the east coast as opposed to the west? Here, you'd want to target the eastern time zone where over half the population lives, then Texas and California/west coast and forget about everything else west of the Mississippi river. They call that "Flyover Country" because you "flyover" it getting to the more important areas. Places like the Dakotas, Kansas, Wyoming etc. Mostly empty states not worth targeting.
Here's some rough maps of Flyover Country:
(Flyover States in red)
As a kid, I was told it was everything west of the Mississippi and east of California, excluding Texas. (on some maps)
Here for instance (depending on platform) The AVERAGE best time to post is 10:30AM eastern time. It's better to publish on Tuesday instead of Monday as on Monday, they are busy catching up on weekend work.
Thursday, is a good day to post movie reviews. Gives them time to make plans for the weekend. Etc, etc.
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Oh wow I had no idea thanks for the heads up, I might try and time my posts better. Yes most of Australia lives on the East Coast in Melbourne and Sydney.