There is no direct service between Auckland and Ho Chi Minh City, so you'll have to make at least one flight transfer at some point. Because of this, it is hard to pinpoint an exact time, as it depends on where you transfer and the time between the two flights. As a guide, the shortest flight I could find was a Singapore Airlines flight, transferring at Singapore. The total time is 14 hours 5 minutes, including a 1 hour 10 minute transfer time at Singapore.
The flight time is 17 hours, 20 minutes.
About the same time it would take to drive from the Oregon border to Los Angeles CA. An all day drive.
3h55 min
The same time that it would take to fly from the US east coast to the west coast. The distance is about the same.
It would take about 21 hours of flying to reach Ho Chi Min from Sydney, Australia.
About a 3 or 4 hour flight from a 1970's era jet airliner.
Ho Chi Min City is the capital city of Vietnam
Flight time from Singapore to Ho Chi Minh is 2 hours
Saigon.
The population of Ho Chi Minh City is 7,396,446.
Ho Chi Minh City was created in 1976.
about 9 seconds 7.5 if there's no wind