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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.
3. Know that the ideal time you should have been running is about a year before you join a marathon. Be comfortable running a distance of about 3 and 6 miles (4.8 and 9.7 km), and training at least 3 days a week for about 15 miles (24 km) or more.4. Try running in shorter races first. 2  Starting with distances like 5k, 10k and a half-marathon. 3  This will be a good way to increase your distances and get used to running in the 'race' environment. 4  You should follow these steps for at least a month before you run or walk your marathon.