FR 1566 then FR 751 at Vienna
Catania → Vienna → Porto
Timetable, Vienna time
22:00FR 1566 from Catania at the gate
12:15FR 751 to Porto leaves the gate
14 h 15 apart on the timetable, overnight
FR 751 leaves 14 h 15 after FR 1566 arrives on the timetable: more than half a day, so not a connection we count.