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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.
Decide if you are ready to run a half marathon. 1  Before you run a half marathon, you should be able to complete a 3-mile (5 km) jog or run at least 3 times per week. 2  At the very least, you should be able to run at a steady pace for 30 minutes.