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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.
For most runners, a marathon is not just 26.2 miles of physical endurance-it means months and months of arduous, painstaking preparation. Typically, those signing up commit to long periods of meticulous planning, a careful diet and a regimented programme of progressively longer runs.