You are going to get some lively discussion with this topic! Check back every day!
Most people will probably tell you not to run so far or so competitively within three weeks of your goal marathon.
But look at some of the advanced training schedules on the web. Those end with 80 mile weeks, consisting of two alternate days of 13.1 miles, two alternate days of 22-24 miles, a speed day, and 1 to 2 rest days. Your plan is no more grueling than an advanced training schedule.
Personally, I've run two of my four marathons this spring within two weeks of another. The only one that I did very well on for me, the fourth (the NJ Shore), was 6 weeks after the third (the Shamrock). That 6-week period included two 10-mile races.
Here is a suggestion for recovery: Run your two marathons. After the first marathon, run a 10k at marathon pace or slower on the next day. You may have to break this initial 10k into two 5k runs during the day. Each day thereafter, run the 10k at a faster pace. By the second day, you should be able to run the entire 10k. Within five days, you should be recovered and back on the training schedule for your goal marathon. That schedule should include a taper, because even though you should be able to run well by the end of the first week, your legs will be tired. (I'm in this first week now after a 4/29/01 marathon, and I had to quit today after 11 miles due to exhaustion.)
Let the comments begin! I feel like Johnny Carson with an envelope on my forehead, predicting the letter inside says, "You will receive a heated debate on this topic!"
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