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How often do calendars sync?

It depends on the type of source calendar:

Sync connections where the source calendar is a Google or Outlook calendar are “real-time” and work based on push notifications (rather than syncing at periodic intervals). This means that changes on a source calendar typically propagate to the destination calendar within a minute (but can take longer depending on factors such as network conditions and number of events on a calendar).

Sync connections where the source calendar is an iCloud or Internet (.ics URL) calendar sync every 5 to 10 minutes. (Apple does not provide a real-time API that third-parties can use).