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Assuming you can run 2 miles now at a nice easy pace (conversational), within 20 weeks you should be able to train up to being able to finish marathon distance at that nice easy pace (between 10 and 12 minute miles) or approximately 4 to 5 hours.
A typical marathon training program is about 16 to 20 weeks. If you're running a mid-October race, you've got about 10 weeks of training to go. That means 10 more long runs, with at least a couple 20-plus-milers sprinkled among those.