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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.
the long run is the cornerstone of marathon training in marathon training it has been found that 3 runs of 18 22 miles over the 8 weeks prior to the marathon are an important predictor of completing the marathont is possible to include some pick ups within your long run if you have run a few marathons already hal higdon suggests not running your long run at your marathon pace however for most long runs he and many others recommend 45 seconds to 90 seconds per mile slower than marathon pace