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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.
1 Commit to training. 2  Dixon says on average people put 16 weeks of structured preparation into running a marathon, and they will be running between four and six times a week, with a long run at the weekend. 3  Eat properly.