I'll be in Washington with my son from 8/7 to 8/11. For Aug 11th I've rented a car at Reagan National for a day trip to see Gettysburg. We're Civil War buffs. Leaving National by car about 8am. We have a return flight to Florida at 7pm on the same day. I'm unsure of the traffic situations on a Saturday and wonder how much time we should spend at Gettysburg to get back to the airport in time. Or otherwise, perhaps some with knowledge may recommend a day trip by car to a different Civil War site that may be as interesting. Thanks in advance of any and all suggestions. I thoroughly appreciate this website.