AC 1953 then AC 8784 at Toronto Pearson
Quebec → Toronto → Washington National
Timetable, Toronto time
23:28AC 1953 from Quebec at the gate
16:40AC 8784 to Washington National leaves the gate
17 h 12 apart on the timetable, overnight
AC 8784 leaves 17 h 12 after AC 1953 arrives on the timetable: more than half a day, so not a connection we count.