Unable to answer "What are the opening hours here?" for https://osm.org/node/1824922002 via StreetComplete 47.0:

For one, the location is off; that spot has never (~20yrs knowledge) been a post office. Moreover, post stuff here has always (same) been handled at the newsagent which is currently Newsextra, one shop north of Chemist Warehouse (which is in roughly the right spot), with toilets between.
But... The only hours listed are on the AusPost sign. (And they're M-F 8-17:30, Sa 8-17, Sun -.)

Attached photo(s):
https://westnordost.de/p/115590.jpg
https://westnordost.de/p/115591.jpg