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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.
This depends on if you are really walking the entire way or throwing in occasional running. If you run a little, figure anywhere between 5 1/2 to 6 1/2 hours for a beginner. â¦ If you walk exclusively, expect 6 - 8 hours for a beginner.Note that you'd want to check the cut off times for races in big cities because they will usually open up the course for traffic in the 6 - 7 hour time frame. More experienced walkers can finish a marathon in the 5 1/2 to 6 hour range. If you walk exclusively, expect 6 - 8 hours for a beginner. Note that you'd want to check the cut off times for races in big cities because they will usually open up the course for traffic in the 6 - 7 hour time frame. More experienced walkers can finish a marathon in the 5 1/2 to 6 hour range.