MNL-AMS on a KLM 77* around 15.5 hours. It felt like it was all uphill in cattle class. APU went bang before departure (whole aircraft shook) but we flew anyway. Last week KUL-LHR 14.2 hours on an A380 with IFE not working apart from "airshow"
Longest I could remember is Aer Lingus A330-300 KJFK-EIDW and backwards when I was a kid. My parents claimed that I've been even longer flight when I was a baby, Miami to London with British Airways, maybe a 747-400 (not sure).
Mine was KMIA - SAEZ (Miami - Buenos Aires) 8:55 on Aerolineas Argentinas. Aircraft was a 747, but I don't remember the details beyond that It was in 1987, so.. I've slept since then. I'm hoping for KDFW-RJAA (Dallas-Tokyo) sometime next year
Nairobi Kenya. RDU-JFK in CRJ then Emirates 777-300ER to Dubai and From there Emirates A-340 to Nairobi. The flights going all had plenty of seats available so we had a row to ourselves in economy each flight. Not so lucky on the way home. All flights full. No fun in economy, but unfortunately we are not filthy rich so had to sit in the back