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This works very similarly on your iPhone. In Settings → Mail, Contacts, Calendars, find your Calendar Subscription and configure the Fetch Interval. Then you can even trigger a fetch manually by going to the Calendar, showing the list of all calendars, and pulling it down (loading spinner appears).
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If you're using Apple Calendar, the default update interval is every 1-3 hours. You have the option to adjust this setting on your iPhone or iPad. Here's how you can do it:
To set your desired update frequency, go to the bottom of the page and adjust the Fetch time according to your preference: hourly, every 15 minutes, every 30 minutes, or manually. Your settings will be saved automatically, and your iCal feed will be updated based on the new frequency you've set. |
For Outlook with Microsoft 365, there seems to be no option to configure the refresh interval manually. According to documentation calendars should refresh at least every 6 hours on the web and additionally at the program start on the Desktop. However, users report some edge cases to take up to 24 hours. For testing, try to re-subscribe to the calendar and verify all issues appear correctly.
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