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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.
To start this plan, you should already be running about 30 to 60 minutes a day, about five days a week. Half Marathon Training Schedule for Advanced Runners: This half marathon training schedule is geared toward runners with long distance running experience.