I'd say for Kings Island, the longest would have to be Son of Beast not in 2000 but the next year an 1 hour 15 mins. In 2000 in October we waited 35 mins for SOB.
And for Cedar Point, Top Thrill Dragster In 2003, waited 2.5 hours. And yeah there was a 30 min break down. We waited for it two times that day, one ride in the morning and another later at night.