LX 1513 then OS 136 at Zurich
Graz → Zurich → Vienna
Timetable, Zurich time
16:45LX 1513 from Graz at the gate
12:40OS 136 to Vienna leaves the gate
19 h 55 apart on the timetable, overnight
OS 136 leaves 19 h 55 after LX 1513 arrives on the timetable: more than half a day, so not a connection we count.