7 Hours on the plane in Gander NF (Canada) due to a diversion because of a mechnical issue on the plane, then 4 hours at the airport then 16 hours at a motel in Gander, then another four hours sitting on the plane waiting to take off. So 32 hours.

My boss almost fired me because she did not believe my story that they delay would last that long.

It was with TWA in 1993.