Istanbul is 1 hour ahead of Prague
Best overlap: 8:00 AM to 5:00 PM in Prague is 9:00 AM to 6:00 PM in Istanbul.
Prague and Istanbul overlap from 8:00 AM to 5:00 PM (Prague) to the equivalent 9:00 AM to 6:00 PM in Istanbul — that's your meeting window. Plenty of room to work with: 9 hours of daily overlap means you can prioritise people's preferences over the clock. Note the seasonal wrinkle: when Prague is on daylight saving and Istanbul isn't, the gap between them grows or shrinks by an hour.