DL 706 then DL 1386 at Atlanta
Denver → Atlanta → Miami
Timetable, Atlanta time
18:01DL 706 from Denver at the gate
15:17DL 1386 to Miami leaves the gate
21 h 16 apart on the timetable, overnight
DL 1386 leaves 21 h 16 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.