LH 3675 then 4Y 1408 at Frankfurt
ZEU → Frankfurt am Main → Varna
Timetable, Frankfurt am Main time
13:52LH 3675 from ZEU at the gate
13:254Y 1408 to Varna leaves the gate
23 h 33 apart on the timetable, overnight
4Y 1408 leaves 23 h 33 after LH 3675 arrives on the timetable: more than half a day, so not a connection we count.