How long is the flight time from Montenegro to Australia?

What is the approximate flight time between the places Montenegro (or; Montenegrin language Montenegrin]]: Crna Gora, Црна Гора, listen, meaning "Black Mountain"), the country located in Southeastern Europe and Australia, officially the Commonwealth of Australia, the country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans?

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Show reasoning Reasoning

I followed this chain of reasoning:

I know from locally stored knowledge that:
42°46'58"N is the latitude of Montenegro ([fact: ["243017626@trueknowledge.com"]])

35°18'00"S is the latitude of Australia ([fact: ["576725396@trueknowledge.com"]])

19°28'00"E is the longitude of Montenegro ([fact: ["646276240@trueknowledge.com"]])

149°08'00"E is the longitude of Australia ([fact: ["576725400@trueknowledge.com"]])

By calculation (generator: ["distance_between3@trueknowledge.com"]) I know that:
15,646.4606504 kilometres is the distance between Montenegro and Australia

By calculation (generator: ["flight_time_between_two_places@trueknowledge.com"]) I know that:
20 hours and 30 minutes is the flight time between Montenegro and Australia

I used the following facts to provide this answer:

42°46'58"N is the latitude of Montenegro

agree disagree edit

35°17'60"S is the latitude of Australia

agree disagree edit

19°27'60"E is the longitude of Montenegro

agree disagree edit

149°07'60"E is the longitude of Australia

agree disagree edit