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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.
Before You Start: You need a solid base before you take on half marathon training. You should be running at least three times a week: Weekday runs should average about 30 minutes, and your weekend long run should be up to at least three miles.