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I have a co-worker who did it in 6 hours one way. Round-trip I guess could be possible but would be tough. There are different entrance points so someone like me could extend it out to how many days it would take to see it all, haha.

I learned thier are plans of constructing a coast to coast bike trail of abandoned railways. Its called, The Great American Rail-Trail. That makes this trail really seem short and makes me wish I was much younger, haha.