The drive from Chattanooga to Memphis, TN is approximately 6 hours.
Grand Rapids, Toledo, Dayton, Cincinnati, Lexington (Ky), Knoxville, Chattanooga, Atlanta, Macon, Orlando. Distance: about 1,280 miles. Driving about 21 hours non stop. Source: Google Earth.
About an hour
Ashburn, Georgia.
2 hours
It is 343 miles according to Google Maps.
About 2 hours and 10 minutes.
24 hrs
about an hour
It depends on the speed at which you drive.
The drive from Orlando to Jacksonville via I-4 and I-95 is approximately 2.5 hours.
Of course, it depends on WHERE in Orlando and WHERE in Tampa ... but, on average, it's about a 1.5 to 2 hour drive.