EC 4733 then EC 1746 at Brussels
Nantes → Brussels → Nice
Timetable, Brussels time
15:50EC 4733 from Nantes at the gate
14:05EC 1746 to Nice leaves the gate
22 h 15 apart on the timetable, overnight
EC 1746 leaves 22 h 15 after EC 4733 arrives on the timetable: more than half a day, so not a connection we count.