Qualifying for Boston

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I have a burning desire to qualify for Boston, but at current pace of 9:11 miles, I'm a full minute and 11 seconds too slow to qualify at #47. I'm curious to know what I can do and how long it will take me to improve my speed to where I can qualify. I need to be able to run the full 26.2 at 8minute miles.

Thanks MFP DR!