LX 326 then KL 9936 at Heathrow
Zurich → London → Amsterdam
Timetable, London time
17:50LX 326 from Zurich at the gate
12:13KL 9936 to Amsterdam leaves the gate
18 h 23 apart on the timetable, overnight
KL 9936 leaves 18 h 23 after LX 326 arrives on the timetable: more than half a day, so not a connection we count.