It's around five and a half hours.
12 hours
18 hours
11
If that's the Vincennes in Indiana (which you might have mentioned), it's between 12 and 13 hours to Myrtle Beach.
5 hours
about 14 hours
12 and half hours
About 8 hours of driving time.
3 and 1/2 to 4 hours
15.5 hrs
about 8 hrs.
It'll take about 14-15 hours nonstop to cover the 900 miles from St Louis, MO to Myrtle Beach, SC.