I actually found this article in Fitness Paddling website:
http://race.fit2paddle.com/
The MR340 is a 340 mile endurance paddling race along the Missouri River.
The articles about Katie Pfefferkorn who enters this 340 mile endurance event. It seems like a pretty grueling endurance race. She works as a Chemical Engineer during the work week and competes in paddling, triathlons, local 5K races, and marathons.
Starting at the age of 21, Katie Pfefferkorn completed the course in a little over 98 hours.
In 2008, she finished in just 50 hours, paddling a 21-foot, carbon fiber racing canoe and sleeping only one-and-a-half hours.
Her times in the MR340 for the last three years...
2006 Woman’s solo, 98:36
2007 Woman’s solo, 58:57
2008 Woman’s solo, 50:00
2009 Scheduled for Aug 4 - 7

In 2007, Kate’s sister Jodi, a filmmaker, made the documentary Down River & Up Hill about the Missouri River 340
Awesome!