Q: What is the exact flying time to Perth from Johannesburg? Direct flight? Is it 12 00? And is it not also 12 00 to London? Why then do people say it is an 18 hour flight to Perth?

A: 11 Hours and 20 minutes: http://www.sa-venues.com/travel-times.htm I would assume that they are referring to stop over flights from Johannesburg to Sydney when referring to 18 hours of flying time.
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