100% this. After 16 hours, I could have kissed the ground when I walked off that plane. At some point, after maybe 8-10 hours, order seems to break down a bit. People stop caring so much about keeping clean, the plane starts to get really cluttered and nasty, food ground into the carpet. I feel for the cleaning crews that have to spruce up the interior after a really long international flight.

I still remember the first time I flew home from the north, we had taken off from Dubai and were headed to Seattle, which goes over the north pole. I watched that silly map more than I should have (it just makes things slower, I'm sure...) and I was so elated the moment we went 'feet dry' over North America. And then I realized that we still had six plus hours to go, more than if we were starting at the east coast. I was so sad for a few minutes I could have cried.

The worst flight I've had in a long time was a British Airways flight to Nairobi. Not actually all that long a flight to Nairobi from London, but BA uses their "This plane is definitely about to be decommissioned" planes on that flight. The panel between the cabin and the fuselage came loose when I nudged it with my foot and slid down into the hold, so I spent the whole flight with essentially all my possessions wrapped around me, certain that anything I dropped would vanish into the void.

Haha, yes. At some point people stop caring. You see people mulling around, getting their own food and drinks - just anything to pass the time.