About 17 and a half hours.
The total direct flight time between Atlanta, Georgia, and Johannesburg, South Africa, is about 16h 33min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 13,574.24km.
I just made this flight a couple hours ago. From Salt Lake City to Atlanta it is almost 1589 miles (according to Delta). From Atlanta to Johannesburg is about 8500 miles, so total is over 10,000 miles.
The total direct flight time between Johannesburg, South Africa, and Malaysia is about 10h 40min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 8,634.61 km.
The total direct flight time between Johannesburg, South Africa, and Seychelles is about 4h 53min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 3,775.33 km.
The total direct flight time between Johannesburg, South Africa, and Abu Ahabi, Abu Dhabi, is about 7h 53min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 6,295.45 km.
The total direct flight time between Johannesburg, South Africa, and Turkey is about 9h 2min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 7,262.81 km.
The total direct flight time between Atlanta, Georgia, and Norway is about 8h 41min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 6,967.62 km.
The total direct flight time between Atlanta, Georgia, and Akron, Ohio, is about 1h 39min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 854.45 km.
The total direct flight time between Atlanta, Georgia, and Fort Wayne, Indiana, is about 1h 36min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 817.07 km.
The total direct flight time between Johannesburg, South Africa, and Amsterdam, Germany, is about 11h 7min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 9,006.56 km.
The total direct flight time between Johannesburg, South Africa, and the Canary Islands is about 9h 34min. This does not include the amount of time you may spend waiting at an airport for a connecting flight. The flight distance is 7,705.98 km.
The total flight duration from Tokyo, Japan to Atlanta, GA is 14 hours, 15 minutes.