The morning drive will suck. The drive home at 3:30pm shouldn't be horrible. As for alternatives, there isn't much. Depending on where you work in McLean, you might try Gallows Road and cutting through the Tyson's shopping center. But I'm not sure if the extra miles and traffic signals will really shorten the commute. Traffic on Gallows that time of the morning isn't too bad.
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http://bible.cc/1_corinthians/13-11.htm