PD 2616 then PD 651 at Toronto Pearson
Boston → Toronto → Las Vegas
Timetable, Toronto time
12:00PD 2616 from Boston at the gate
07:00PD 651 to Las Vegas leaves the gate
19 h apart on the timetable, overnight
PD 651 leaves 19 h after PD 2616 arrives on the timetable: more than half a day, so not a connection we count.