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.
A typical flight from Sydney, Australia to Rome, Italy takes about 20 to 21 hours.
You need 19 hours to flie from Rome to Sidney.
it's 9100 kilometers, so around 12 hrs. See www.howmanyhours.com
6hr 05min Doha (DOH) to Rome Fiumicino (FCO) by a nonstop flight operated by Qatar Airways.
3 hrs. 35 min., non-stop