I really doubt there would ever be any reason to take a 16 hour flight in this day and age. Sounds like retard stuff
Discussion
You're not in AU / NZ, and not planning to visit. For the rest of us, its a "sometimes" torture...
With the invasion of Ukraine and the closure of the Russian airspace, any flight from Western Europe to Asia is now at least that long. And if you have to connect along the way, it's almost certain to be 20+ hours.
Flights to the US are 7-8 hours to the East coast, and easily 12-13 to the West. A couple more if you're in Central Europe, and add any random number if you are flying out of a non-main airport and have to connect.