BA 903 then BA 862 at Heathrow
Frankfurt am Main → London → Prague
Timetable, London time
17:25BA 903 from Frankfurt am Main at the gate
17:20BA 862 to Prague leaves the gate
23 h 55 apart on the timetable, overnight
BA 862 leaves 23 h 55 after BA 903 arrives on the timetable: more than half a day, so not a connection we count.