Ottawa is 6 hours behind Madrid
Best overlap: 2:00 PM to 6:00 PM in Madrid is 8:00 AM to 12:00 PM in Ottawa.
Target 2:00 PM to 6:00 PM in Madrid, which lands at 8:00 AM to 12:00 PM for the Ottawa side. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day.