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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.
In this long run, you start at your normal run pace but you try to average your goal marathon pace for the last 30 to 60 minutes of the run. In most programs, I simply alternate the two types of long runs-one weekend, long, steady distance and the next, a fast finish long run.ow to Implement. While I recommend a two-hour long, steady run virtually year round for most runners, you should not start the fast finish long runs until 8-10 weeks before the marathon. Too many of these workouts and you will peak too soon and be flat by marathon day.