How long have you travelled for? You can say where you travelled from and the destination if you like.
I am talking about direct non-stop flights by the way. Stops do not count.
The longest non-stop I have been on was a 14 hour flight from Los Angeles, CA to Sydney, Australia.
A single flight - 14h. Done it a couple of times; Singapore to Paris on Singapore Airlinesus.
However, recently I did Dublin to Melbourne - It was two stops (Dubai & Malaysia) but I got literally no sleep on any flight, so from the time I left Dublin to when I got home to bed it was 34 hours in transit. Awake the whole time.