You see, the MCT is 60 mins. But I don't care about MCTs, they are rarely a specific cut-off.

Connecting from REP to HKG, I have the choice of a 5 hour connection, a 45 minute connection, or an overnight. I will be choosing the 45 min connection, unless if somebody convinces me that my chances are dire. I will be in J and travelling with hand luggage. On one ticket, VN normally issues your BP at the first departure point even if you're connecting to CX.