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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.
Keep in mind that the Nashville Marathon requires you to complete the half marathon within 4 hours and the full in 7 hours. If you know your average pace per mile, click here to calculate your estimated finish time using distance (full or half marathon) and pace. Remember to add 2-3 minutes per mile to your regular pace to accurately predict your half or full marathon pace. Run or walk three miles at a moderate, sustainable pace.