SG 83 then K6 723 at Bangkok
Kolkata → Bangkok → Phnom Penh
Timetable, Bangkok time
02:55SG 83 from Kolkata at the gate
15:20K6 723 to Phnom Penh leaves the gate
12 h 25 apart on the timetable
K6 723 leaves 12 h 25 after SG 83 arrives on the timetable: more than half a day, so not a connection we count.