(Didn't we just do this topic?)
I don't count a particular coaster's laps, because by the time I realized that I was a total enthusiast I'd already worked at Cedar Point for 3 seasons and visited repeatedly with family and friends. With no way to accurately count those rides, I figured why bother, and just count the coasters themselves. Of course, 30 is a pathetic number for now, but hopefully still going up sometime this fall.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html