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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.
Walking a marathon takes at least 6 hours for a really fast fit walker -- generally walking a marathon takes 7 - 8 hours. 4 people found this useful. 1  Beginner's Tips on Training for a Marathon If you have made it your mission to get more fit, running in a marathon may be a goal you have set for yourself.