We did 75...drove from Chicago, Illinois, straight through and it took 24 hours, but that was only because we hit the Atlanta ice storm. Without that, it would have been around 19 hours. There was only one mountain to go down in Tennessee, and other than that it wasn't bad. We drove through Atlanta rather than around it because the roads were pure ice and they were doing the most salting/sanding right around the city. Overall, other than the storm, it really wasn't a bad drive. We left at 6 p.m. so we could get the night over with first and then get a boost with the sunlight in the morning.
Barb