Houston is 12 hours behind Ho Chi Minh City

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

Houston is 12 hours behind Ho Chi Minh City, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Houston dials in early while it's still late afternoon or evening in Ho Chi Minh City. Keep an eye on the calendar — Houston observes daylight saving and Ho Chi Minh City doesn't, which nudges this window by an hour twice a year.