I certainly can understand why this is called the "Dopey Challenge." That is a lot of running, by anyone's standards.
I ran cross country in college, and I did many of these distances. Here are my personal bests:
5K - 15:50 (on the track)
10K - 33:15 (in cross country)
Half-Marathon: I ran several of these, but I can't remember my best time.
Marathon: 2:43 (immediately after my senior year cross country season in college)
I ran the Omaha Marathon (3:14), the Iowa City Marathon (2:43), and the Pike Peaks Marathon (only the ascent, and I have no idea of what my time was). The coolest part of the Pike's Peak Marathon is that you don't get your T-Shirt until you reach the top. As a long-time runner, I know it was not uncommon for someone to sign up for a race, pick up their shirt the night before, and then never show up to the starting line. Personally, I would be ashamed to wear a T-shirt from a race if I hadn't participated.