Almost 3 days once when flying to the US via Amsterdam. After 24 hours I felt slightly dizzy and funny feeling in pit of my stomach, after 40 hours that went away but everything felt "dull" and I was having trouble concentrating on anything - someone would talk to me and I wouldn't even realise. At some point around 40 hours I'd start noticing inanimate objects would appear to move or bend heh. Coming up on 70 hours I was having trouble distinguishing if I was awake or dreaming.
Slept 10 hours straight after and felt fine, but after I flew home again a few days later as I walked into my bedroom it all hit me and I wiped out completely - slept 2 days straight.