You are aware that flights can take longer due to weather, delays with landing, and other events that can cause a flight to last longer than the scheduled durat

You are aware that flights can take longer due to weather, delays with landing, and other events that can cause a flight to last longer than the scheduled duration? Also, a "turnaround flight" is an industry term meaning that the crew (pilots and attendants) are assigned for the outbound and return flights, and remain on the aircraft. So the 10 hour one way flight (assuming the pilot meant Doha to Tokyo) means at least 20 hours of flight time, plus the time spent in the plane at the origin and destination airports.