EW 2520 then SQ 387 at Barcelona
Stuttgart → Barcelona → Singapore
Timetable, Barcelona time
14:25EW 2520 from Stuttgart at the gate
12:35SQ 387 to Singapore leaves the gate
22 h 10 apart on the timetable, overnight
SQ 387 leaves 22 h 10 after EW 2520 arrives on the timetable: more than half a day, so not a connection we count.