Summary: The way down was a lot slower than the way up, but still not too bad.
Left home at around 3pm; there were a few reports of slowness on the NJ Turnpike, so I just skipped it entirely, taking Route 1 South (which is kind of like the built-up parts of Lee Highway, lots of lights, and just as jammed up in spots, too), to Route 295 South (smooth sailing).
Getting into Delaware, though, it was already congested in the usual spots, so I detoured down another Route 1 (Delaware), to go around and down via the Chesapeake Bay Bridge.
Route 1 in Delaware has a bridge that's lit up nicely at night -- it's the Chesapeake & Delaware Canal Bridge (the Senator William V. Roth, Jr. Bridge). One of these days, I'll figure out how to take a good shot while (driving) in a moving car. I got a couple of crappy pics, instead:
The Bay Bridge route was uneventful (going through those small towns in Maryland can be kind of a pain, though). I took Route 50 in and cut through the District, to avoid any Beltway backups because of the football game.
Travel time, just under 5 hours.