How long is the flight time from Durban International Airport to Ronald Reagan Washington National Airport?

What is the approximate flight time between the places Durban International Airport (formerly Louis Botha Airport), the international airport of Durban from 1951 until 2010, when it, replaced by King Shaka International Airport, to the north and Ronald Reagan Washington National Airport, the public airport located south of downtown Washington, D.C., in Arlington County, Virginia?

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I followed this chain of reasoning:

I know from locally stored knowledge that:
29°58'06"S is the latitude of Durban International Airport ([fact: ["154297681@trueknowledge.com"]])

38°51'08"N is the latitude of Ronald Reagan Washington National Airport ([fact: ["136062569@trueknowledge.com"]])

30°56'52"E is the longitude of Durban International Airport ([fact: ["154297697@trueknowledge.com"]])

77°02'16"W is the longitude of Ronald Reagan Washington National Airport ([fact: ["136062568@trueknowledge.com"]])

By calculation (generator: ["distance_between3@trueknowledge.com"]) I know that:
13,496.4699885 kilometres is the distance between Durban International Airport and Ronald Reagan Washington National Airport

By calculation (generator: ["flight_time_between_two_places@trueknowledge.com"]) I know that:
17 hours and 30 minutes is the flight time between Durban International Airport and Ronald Reagan Washington National Airport

I used the following facts to provide this answer:

29°58'06"S is the latitude of Durban International Airport

agree disagree edit

38°51'08"N is the latitude of Ronald Reagan Washington National Airport

agree disagree edit

30°56'52"E is the longitude of Durban International Airport

agree disagree edit

77°02'16"W is the longitude of Ronald Reagan Washington National Airport

agree disagree edit