DL 706 then DL 659 at Atlanta
Denver → Atlanta → Las Vegas
Timetable, Atlanta time
18:01DL 706 from Denver at the gate
15:29DL 659 to Las Vegas leaves the gate
21 h 28 apart on the timetable, overnight
DL 659 leaves 21 h 28 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.