JQ 971 then JQ 476 at Melbourne
Perth → Melbourne → Williamtown
Timetable, Melbourne time
06:30JQ 971 from Perth at the gate
18:45JQ 476 to Williamtown leaves the gate
12 h 15 apart on the timetable
JQ 476 leaves 12 h 15 after JQ 971 arrives on the timetable: more than half a day, so not a connection we count.