Two trips...
First, South Bend, IN, to Atlanta, GA. Left South Bend at 6PM. Got to Atlanta around 9AM. 14 hrs. Didn't sleep a wink. I was caravanning with a bunch of friends heading for a wedding in Birmingham. We decided to "vacation" in Atlanta for a couple of days. Horrible idea. I should've gone straight to Birmingham. Birmingham to South Bend was a 10 hr drive. Fortunately, I had company to help me stay awake.
Second, South Bend, IN, to Wichita, KS. Left South Bend at 2PM. Got to Wichita at 4AM. 14hrs. All alone, and I didn't sleep a wink. Reversed this trip 2 weeks later, but I lost several hours in Lawrence and Kansas City. So, on the return home, I didn't get into South Bend until around 8 AM.
As long as I have good music, I'm set. I usually get antsy around 6 or 7 hours into a drive and want to get out from behind the wheel.
Ryan