The drive time is about 23 hours, 1445 miles. We've done this 6 times and we are doing it again in Jan '05 and then again in Sept '05. DH does most of the driving. We do stop on NC on the way down and VA on the way home for an overnight. We've done the straight thru drive twice on the drive down, found it was not worth it on the 2nd one. We always stop now. It's safer and we arrive better rested.
We've really grown to enjoy the drive (used to HATE it, but DH hates to fly). We use it as true quality family time now. BTW, our kids are now 10 and 14. We've been doing this since they were 7 and 10. DS brings his gameboy and always 1 or 2 new games. DD reads and draws and, now, plays her gameboy a little bit.
I am the navigator, so, basically, when we are not in NYC or DC...I snooze or read.
We also play road trip games and goof off, except DH, of course... We've made up some pretty crazy songs over the years and laugh so hard!