Google Maps show it at around 12 hours - mostly on Interstates.
What information are you wanting from us that you can't get from Google Maps or mapquest?
I went to school in Annapolis, but that was 40 years ago. It took me 15 hours to drive it. I just came back from the east coast (Boston, not DC) this week and from Columbus (where I routes would coincide) there wasn't any construction worth speaking of, though there are a few pot holes around Dayton worth noting, but that is typical of this time of year many places.
Nicest restaurant on the entire route is the Beef House in Covington, IN (at the Illinois border) about 90 minutes east of Decatur. But if you need to make the trip all in one day, you won't have time to stop.
Traffic can be bad around Columbus during rush hour, but I don't know it well enough to say whether to take I-70 through or the beltline around it. In Indianapolis, if you hit it at rush hour, do take the beltline around the south side of town.
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