Cairo-Bucharest: 2h 50 min (with TAROM)
From Sydney to Rome, it is about 16315 kilometres (10197 miles), and a flight would take about 17 hours and 57 minutes. However, 20 hours is more accurate.
It takes 13 hours.
If you live in Okinawa, I suggest connecting through Tokyo. From there it would be 10 hours.
it's 9100 kilometers, so around 12 hrs. See www.howmanyhours.com