When the shotgun blast echoed throughout the canyon, announcing the end of the 24 hours of climbing, I felt like I still had another hundred pitches in me. I lowered my partner from his final route and we raced back to the Trading Post just in time to turn in our scores.The 2018 edition of 24 Hours of Horseshoe Hell (24HHH) marked my fourth time competing in the event. The challenge is simple: climb as many pitches at Arkansas’s Horseshoe Canyon Ranch as you can in one day, 10 a.m. Friday to 10 a.m. Saturday. I first heard about it…