I trained for 2 marathons in 2010 and I did it by running 3-5X a week. Usually 3. Check out my workouts.
I was out of the country for half of June and was trying to take it easy before I started training for NY at the end of June.
Here is a link to how I ran over 1000 miles in 2010 while training for TWO marathons!
Check here to see how I trained for the 2010 NY Marathon!