Australia maybe a long way away but if you have grandchildren out there, then the potential 30 plus hours travel might just be worth it.
Australia is currently 22 to 24 hours away if you fly with British Airways via Singapore or Bangkok. The layover in these two cities is quite short, but in reality you might want to actually have a longer stop in between.
Flying two lots of 10/12 hours can be very punishing, to say the least!
There is even talk of flights to Australia from the UK being completed in one go, that would be from London to Perth, but would involve a very tough 18 to 20 hours flight.
Imagine being in a bad seat for the length of time, perhaps one that doesn’t recline. It would be something approaching a nightmare.
Until such a time that super sonic flights happen, maybe it’s better to have that 3 hour leg stretch in Singapore.