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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.
As you extend the long one to 26 miles, you build the exact endurance necessary to complete the marathon (14 to 15 for the half marathon, eight to 10 for the 10K). Those who have marathon time goals can extend their capacity by running as far as 30 miles three to four weeks before the marathon.