Well I've spent 14 (ish) hours in a KLM B777 MNL/AMS, and in the days when I was a smoker, what's the difference between 14 and 18 hours, once one has been in an aluminum tube for that long an extra 4 hours isn't very long at all.
I recall when I was positioning LHR/BKK/SYD/MEL, I just wanted the journey over and done with as quickly as possible rather than all these damn stops!