NH 8421 then MM 623 at Narita
Chicago → Tokyo → Taipei
Timetable, Tokyo time
18:38NH 8421 from Chicago at the gate
16:40MM 623 to Taipei leaves the gate
22 h 02 apart on the timetable, overnight
MM 623 leaves 22 h 02 after NH 8421 arrives on the timetable: more than half a day, so not a connection we count.