Well, the Terrapin Marathon was almost the Terrapin 50k. A couple people ran with GPS watches and clocked it in at 29.8 miles. There was some significant climbing and some ROCKY downhills, but the overall elevation gain/loss came in at around 6250'/6250' on my Suunto Vector.
I finished in 5:15, with no major damage. I'm off to dinner with the family now, but I will write a more in-depth report.
Tough runs, the Terrapin Marathon and Half-Marathon. I highly recommend them to anyone looking for a challenge.
Update: Out of town on business -- update coming soon. In the mean time, recovery was fantastic (thanks to nuun), and I did a great interval workout on Tuesday.