My longest wait was during Top Thrill Dragster - Joe Cool, Opening Day 2007, replacement ERT for Maverick.
The ride kept getting Roll-Backs. I started midway up the ramp that morning, near the station, and it took 2 hours to get the 1st ride of the year in.
Ask 0g he was there, and he got a roll-back in the train right before mine. Darn you 0g 
Never will I wait 2 hours for a ride - again...
I believe Maverick was 2nd longest wait, at about 1 hr 45 min. - Memorial Day 2007. That was the only ride I got on that day. Then we went over to Soak City.
Good Bye 2007
Hello - 2009
(If I am lucky I'll get 1 visit in '08)