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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.
The amount of time it takes to get in shape for a marathon differs depending on how fit you are currently. You should be able to run at least 15 to 25 miles per week and have participated in one or more shorter races in the past.f you have been running long distance regularly, this time period provides you with a cushion to increase your pace and strength before the big event. Start out running anywhere between 15 and 25 miles per week, depending on your workout history, and gradually increase to 30 miles per week if you can handle it.