The longest I've gone in an actual car was when I moved to Phoenix and later on when my sister and I went to Tucson to get my car and drive it back.

From Nashville, that's a 24 hr drive.

If you're going on a long trip ('cuz I don't know how far it is you're going), my best advice is to sleep as much as possible when you're not driving. That's what my sister and I did... On the way back to Nashville, we laid down my back seat and switched out every 3 hours or so and whoever -wasn't- driving, slept.

I've traveled a ton in my life, but most of it was when I was a kid and went in the big truck with my dad. There was a sleeper for me to hang out in and my dad had one of those tv/vcr combos rigged up for me to watch movies and stuff on. And he'd buy me toys and coloring books and trout on the road. So yeah..