Istanbul and Osh Time Zone Comparison
Istanbul and Osh are two major cities that sit in noticeably different time zones. Istanbul and Osh sit on different continents, in noticeably different time zones, and neither observes daylight saving time.
Istanbul is always 3 hours behind Osh, with no seasonal change, since neither city's daylight saving rules shift this relationship.
With a moderate gap like this, it's worth checking the suggested call window above before scheduling a meeting between Istanbul and Osh.