I spent the day exploring other trails in Penitente Canyon. I found an unnamed ATV road not on my map and said to myself, "Ooh, I wonder where this goes..."
At 9 miles, I had to turn around because the road kept on going and going, plus it was taking me higher in elevation and making me huff and puff so my pace was slower. I did a quick reading of the Sun and realized I needed to head back. I raced the Sun the entire way back and finished just in time. 15 minutes more and it would have been dark since the days are still short.