QF 1516 then QF 1990 at Sydney
Melbourne → Sydney → Townsville
Timetable, Sydney time
18:40QF 1516 from Melbourne at the gate
11:10QF 1990 to Townsville leaves the gate
16 h 30 apart on the timetable, overnight
QF 1990 leaves 16 h 30 after QF 1516 arrives on the timetable: more than half a day, so not a connection we count.