DL 706 then DL 2174 at Atlanta
Denver → Atlanta → Charleston (South Carolina)
Timetable, Atlanta time
18:01DL 706 from Denver at the gate
15:15DL 2174 to Charleston (South Carolina) leaves the gate
21 h 14 apart on the timetable, overnight
DL 2174 leaves 21 h 14 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.