LH 906 then BA 672 at Heathrow
Frankfurt am Main → London → Thessaloniki
Timetable, London time
12:50LH 906 from Frankfurt am Main at the gate
10:25BA 672 to Thessaloniki leaves the gate
21 h 35 apart on the timetable, overnight
BA 672 leaves 21 h 35 after LH 906 arrives on the timetable: more than half a day, so not a connection we count.