There are a handful of runners who try for world quantity records, which requires them to run about two marathons per week. That is the upper limit for quantity.
As a beginning marathoner, you could run a second marathon two weeks later than your first marathon. You would not enjoy the second marathon, but your conditioning plus the pacing knowledge you gained from your first marathon might take you to a PR.
If you wait four weeks, then you should definitely be capable of a PR on your second marathon.
Anything over four weeks will require you to go back to a training schedule with long runs and a taper. Check the recent postings on this bulletin board, because someone just recommended a book that had training schedules for runners who want to enter multiple marathons in a single season.
Personally, I'm a fan of the multiple-marathon school. As long as you are running at a non-Boston pace, each marathon should serve as a great training run for your next marathon. Once you get to sub-Boston pace (which I haven't done), then the physical effort required may be too great to allow you to recover quickly. You could search the results for Michael Westian, Oakton's top marathoner, to see how long he rcovers before winning another local marathon. He runs about a 2:30 marathon.
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