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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.
1 This 20-week marathon training schedule is geared toward runners who can run 4 miles comfortably and can run 4 to 5 days per week.  This 18-week marathon training schedule is geared toward intermediate runners who have already run a marathon, currently run five days a week, and can run up to 6 miles at a time.