After a marathon or any race many people, I cant think of a solid reference - maybe Greg McMillan, suggest to do a reverse taper. Using McMillan's it would be 50% of normal (20 miles) for following week, 75% of normal for the next (30 miles), 80-90% for the third week, and back to normal from there.
Alternatively, Hal Higdon relates a saying from some other famous runner (Prefontaine?) who says take one day off for every mile raced. So kick back and relax :) or do some cross training.
I like to jog the soreness off over 1-2 weeks. I like to think that this easy work out is helping me to recover and push my body to replace the muscle and add a little.