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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.
Among women runners, the median finishing time was 4:42:53. Not surprisingly, the average time it takes to run a marathon increases as you get older. For example, the average for males between 30 and 34 years of age is 4:00:11, while the average for those 50 to 54 years old is 4:23:0.