Montreal is 11 hours behind Hanoi

There is no standard 8-to-6 overlap. Someone joins early or late.

Montreal is 11 hours behind Hanoi, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Montreal dials in early while it's still late afternoon or evening in Hanoi. Keep an eye on the calendar — Montreal observes daylight saving and Hanoi doesn't, which nudges this window by an hour twice a year.