I am in Snickster's "listen to your body" camp.
Ran my first Marathon 10 days ago (3:19), felt good after 2 rest days, so started with a gentle hilly run on day 3 - slight leg heaviness uphill, but nothing sore. Next day, no stiffness at all and I am now training again at a normal level.
I guess I have'nt fully recovered yet, so no races or runs over 10 miles for at least another 10 days - and I am being careful to "listen" for any aches and pains.
Time will tell if this is too fast, it took me longer to recover this much after a hot, hilly PB half marathon earlier in the year.