Bucharest is 7 hours ahead of Ottawa
Best overlap: 8:00 AM to 11:00 AM in Ottawa is 3:00 PM to 6:00 PM in Bucharest.
For the smoothest call, aim inside 8:00 AM to 11:00 AM in Ottawa, i.e. 3:00 PM to 6:00 PM in Bucharest. A 3-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day.