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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.
Long Runs: The key to getting ready to finish a Half Marathon is the long run, progressively increasing in distance each weekend. Over a period of 11 weeks, your longest run will increase from 5 to 12 miles. And in the final week, you get to run 13.1 miles in the race itself.