Question:  Lisa Smith-Batchen was the first American to win  Marathon des Sables a six day marathon that spans how long of a distance?
Sentence (from "Camille Herron"): In October 2015 she set a new "World Road Best" for 50 Miles at the Fall 50/US 50 Mile Road Championship running a time of 5:38:41 on the USATF Certified and Sanctioned course.
Relevant evidence: No