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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.
Marathon Distance. All marathons are 26.2 miles (26 miles and 385 yards) or 42.195 kilometers. The difference between the various marathon courses comes in their terrain, rather than their distance, ranging from extremely fast, flat courses such as Chicago to more challenging, hilly courses such as Boston. The Boston Marathon is 26.2 miles long.