Ottawa is 6 hours behind Vienna
Best overlap: 2:00 PM to 6:00 PM in Vienna is 8:00 AM to 12:00 PM in Ottawa.
Schedule calls for 2:00 PM to 6:00 PM in Vienna — your colleagues in Ottawa will be online from 8:00 AM to 12:00 PM. Around 4 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day.