152 minutes for Space Mountain (wait time was 120!!!!!). Yes, I timed it. I didn't really want to wait, but it was my son's first time tall enough for the ride and he'd always wanted to go. Because he told my sister that was what he wanted to do the most, she waited with him and I grudgingly waited too. I would have gotten fastpasses and kind of thought I did, but in the lead up to the trip, he told me he wanted to ride SPLASH mountain. So I fastpassed that several times over a couple of days. Turns out he meant SPACE mountain and since we were there Xmas week, I was not able to score any last minute fastpasses.
Cherry on top - he hated it. His favorite coaster turned out to be Big Thunder - which worked out well in the end since I'd fastpassed that a lot too as it's my favorite coaster.
I have neither waited in line nor fastpassed Space Mountain since then. I think I have some form of PTSD, not to mention sharp memories of whiplash.