From August 10 to August 19, 2006, Stefan Seemann of Germany rode this ride for 221 hours and 21 minutes. In that time, he completed 4,431 rides. This record was recognized by the "Guinness Book of World Records," but it was broken just one year later when Richard Rodriguez went to England and rode Blackpool Pleasure Beach's Big One for over nine and a half days.
If you have ever been on a Boomerang, you know that they are not easy coasters to ride. I have been on a few dozen Boomerangs, and they are all pretty rough. I can't imagine doing a marathon on one.