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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.
Congratulations on your decision to train for your first marathon! This training schedule (see table below) is perfect for a beginner runner and a first-time marathoner whose goal is to finish the 26.2-mile race. To start this beginner marathon training schedule, you should have been running for at least six months and should have a base mileage of 12-15 miles per week. Training for a marathon is a huge endeavor, so it's good to think carefully about what's involved with the training.