Before it was redone, I could do it once and feel a little yuck, but nothing awful. After it was redone in 3D, however, I got about a minute into it and got so motion sick that I had to close my eyes. I just couldn't do it. Which was a bummer because I was the rebel spy and I wanted to enjoy it a little more. But holy cow, I just couldn't do it.
And I can ride Dinosaur 20 times back-to-back with no issues. Rides like ToT, RRC, Space Mtn, BTMRR, EE, those don't bother me and I can usually do them 2 or 3 times back-to-back before I need a break... After 5 mins, I'm OK. Star Tours... That just leaves me feeling yuck for hours and hours.