Istanbul is 7 hours ahead of Montreal
Best overlap: 8:00 AM to 11:00 AM in Montreal is 3:00 PM to 6:00 PM in Istanbul.
The overlap falls at 8:00 AM to 11:00 AM in Montreal, or 3:00 PM to 6:00 PM if you're in Istanbul. Istanbul is 7 hours ahead of Montreal. That leaves about 3 hours of common time — enough for a meeting or two, so use it deliberately. Just remember Montreal changes its clocks for daylight saving and Istanbul doesn't, so confirm the overlap whenever the seasons turn.