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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.
Beginners: Your 12-Week Half Marathon Training Plan. Assuming you're doing 4 to 5 miles once a week, 12 weeks gives you plenty of time to build up to a 10- or 11-mile long run. You don't necessarily need to run 13.1 miles in training to be confident that you can finish the 13.1-mile race, yet you don't want your longest run to be just 8 miles.