BA 845 then BA 584 at Heathrow
Warsaw → London → Milan Linate
Timetable, London time
15:00BA 845 from Warsaw at the gate
13:15BA 584 to Milan Linate leaves the gate
22 h 15 apart on the timetable, overnight
BA 584 leaves 22 h 15 after BA 845 arrives on the timetable: more than half a day, so not a connection we count.