I-75 is 1786 miles long. At an average 60 mph, it would take 29 hours, 46 minutes.
About 2.5 hours on the US Interstate Highway system.
The distance from Jekyll Island, Georgia to Savannah is 93.1 miles. The drive would take about an hour and a half on Interstate 95.
Obviously that depends on how fast you drive and how often you stop. If most of the way is Interstate, it would take me around 14 hours.
If you traveled on Interstate 76W and Interstate 80W from Philadelphia PA to Denver CO the 1745 miles would take you 26 hours. If you took Interstate 76W and Interstate 80W from Philadelphia PA to Denver CO the 1745 miles would take you 26 hours traveling an average of 67 mph.
The answer to your question depends on how fast you drive and how many stops you have.
About 5.5 to 6.5 hrs.
3 hours
@65mph - 1 hour 29 minutes. @75 mph - 1 hour 17 minutes.
About 1½ hours via Interstate 75
The drive is 383 miles, with a drive time of about 6 hours, assuming you take the Interstate (I-5) rather than the coast highway.
It takes about 45 minutes to one hour if you take Interstate 95 North.
That depends on the speed limit. At 60 mph, it would take 45/60 = .75 hours , or 45 minutes ( a mile per minute)