DL 2599 then DL 493 at Atlanta
Madison → Atlanta → Denver
Timetable, Atlanta time
22:59DL 2599 from Madison at the gate
20:45DL 493 to Denver leaves the gate
21 h 46 apart on the timetable, overnight
DL 493 leaves 21 h 46 after DL 2599 arrives on the timetable: more than half a day, so not a connection we count.