Ottawa is 6 hours behind Prague
Best overlap: 2:00 PM to 6:00 PM in Prague is 8:00 AM to 12:00 PM in Ottawa.
Your shared working hours run 2:00 PM to 6:00 PM in Prague (8:00 AM to 12:00 PM in Ottawa). You get roughly 4 hours of shared time, so aim for the middle of that window to keep the call comfortable for both teams.