Yes, it's 13.1 miles. The race starts at 7am and finishes at 1pm, so as long as you finish in 6 hours, you should be able to power-walk it. That's almost 30 minutes per mile, you should be able to easily finish walking 13.1 miles in much less than that (probably more like 4 hours).
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New to the marathon experience - the half-marathon in Alexandria, Va. - that's 13 miles, right? Can we power-walk instead of running?
Thanks