I feel seen. ;-)
I remember when the 6 hours it took to fly to North America was the longest flight I thought I could take without going insane.
Well, I recently tried the 15 hour long version of going from Japan to France above the Arctic instead of flying over Russia, and... well, I guess that after a while, you just resign yourself and your brain tunes out (I even managed to sleep a little)
(I'm talking one flight here, the whole trip is around 24 hours)