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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.
Beginner Runner Time Commitment. If you've never run a marathon and you're currently running under 15 miles each week, expect to spend 18 to 20 weeks preparing for your marathon. You should plan on running at least three times a week in the beginning, and at least four times a week as your training progresses.