It took my family and extended family about 12 hours to get there from Plainfield. We only made 2 stops along the way - once when we were in the DelMarVa area and once right before we got to the house we were staying at.
But we were driving in the middle of a Hurricane at the time, so we probably could have gotten there in about 8-10 hours if we didn't make those 2 stops and if weren't for the bad weather.
8 hours or so; depends when you go. If you get stuck in Saturday traffic during the summer it could be closer to 12.