The longest wait time we saw was in 2005- it was the 1st weekend in October, and the Free Dining promo was just ending. It was also during the Food & Wine Festival, so Epcot was really crowded. We didn't wait in line for it, but Soarin had a 110 minute wait time posted, and the FPs were all gone. this was about 4pm, and it was also when Soarin' was pretty new.
That wait was really unusual, though- the rest of the week, we never waited more than 20 mins for any other rides throughout all of the parks (we did use FP when necessary, and did the big rides first thing in the AM). Soarin' had at least a 60 min wait time posted every time we saw it all week, so we never rode it on that trip.