Cairo is 4 hours behind Hanoi

Best overlap: 12:00 PM to 6:00 PM in Hanoi is 8:00 AM to 2:00 PM in Cairo.

For a call that suits both sides, look at 12:00 PM to 6:00 PM in Hanoi / 8:00 AM to 2:00 PM in Cairo. Despite the 4-hour difference, a 6-hour overlap keeps things simple and gives both teams breathing room. Keep an eye on the calendar — Cairo observes daylight saving and Hanoi doesn't, which nudges this window by an hour twice a year.