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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.
You should have a base mileage of 12-15 miles per week to start this training program. 22 Week Marathon Training Schedule for Beginners: This simple marathon training schedule will get beginner runners marathon-ready in 22 weeks. To start it, you should be able to run at least 3 miles. Advanced Beginner Marathon Training Schedule: This 20-week marathon training schedule is geared toward advanced beginner runners. To follow this training schedule, you should be able to run four miles comfortably and can run at least four days per week.