Doing these long training runs, I've been much more focused on recovery afterwards.
Some things I've read is that it's important to eat/drink right away to replenish what you have spent, which is kinda funny cause I am the least bit hungry right after a long run where I have had to force myself to eat Gu throughout (or NBBW's latest find Huma Chia energy gel - it doesn't freeze up like the Gu does when running in freezing temps).
What the 'experts' recommend for recovery: Eat carbs early, protein late. Eat consistently. Eat 2 hours prior to exercising (so you aren't spending calories on digesting). And eat immediately (within 30 min) after a hard workout.
I also think cross-training the next day and even a light run to stretch out sore muscles is good for recovery. And hoppy beer.