The last time I attempted anything remotely like this was after I finished my first marathon, at Walt Disney World in January 2010, and that was only lukewarm water. I just attempted it a few minutes ago with ice cold tap water. Interestingly (and fortunately), I didn't freeze my ass off. However, my upper leg muscles would not stop shivering and quivering like a bowl of flesh-colored Jell-O. It also helps if you set the timer on your watch for 10 minutes instead of 10 hours. Fortunately, I checked the clock on my bathroom wall before I got in!
Whether it helps with my recovery remains to be seen. I'll have to see how I feel when I wake up tomorrow morning. Right now, though,I think I'll go and sit on my radiator for a while.