Delta airlines claims about 52 hours, which I think is too much, You should check your local airlines' website.
For direct flights, about 9.75 hours flying time.
Sydney is four hours ahead of Hanoi from early October until early April and three hours ahead from early April until early October.
8 hours
14 hours
The flight from Sydney to Nadi Airport in Fiji is between 3.5 and 4 hours.
Flying time between Sydney and the Gold Coast is about one hour, give or take a few minutes, depending on the airline.
The time difference between London, UK and Hanoi, Vietnam is 6 hours. Hanoi is 6 hours ahead of London. So, when it is 3 am in Hanoi, it is 9 pm in London.
The flight time from Sydney, Australia to Miami International Airport is about 18 hours, 40 minutes.
less than 24 hours
9 hours
About 18 hours.
A typical flight between Sydney, Australia and Quito, Ecuador would have a flying time of about 16 hours, 55 minutes.