I rode the Dragon at the Fun Dome this March about 170 times, in about four hours. Actually boarded the ride only four times, but being an arcade place, not many people were there to ride the coaster. The ride op was great, helping me keep track, turning the station brakes off, and making sure the lift was always on "high." I have to admit though, 170 times on that little thing was pretty painful, it whips you around more than enough, especially on that high lateral helix.
Last June, I also rode the Steel Phantom 60 times in a day, with my best bud Joe. That was probably the more intense day, and a lot more fun! It's surprising how much you can ride a coaster when you factor out wandering around the park, long sit-down restaurant breaks, and gentle rides.
Riding laps on coasters are probably my favorite thing to do in the world.