Calendar updating when events change

I am going to try to use the google calendar sensor to trigger prinkler on/off. Pretty easy automation. But what I notice a new calendar entry with search criteria doesn’t get picked up by HA immediately , is there a interval between calendar updates? A stop and restart of hass picks it up.

Looks like 15 minutes from the code:

# Return cached results if last scan was less then this time ago
MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=15)

Good to know, thanks

What code is this? Can I change the duration?

Response a bit late, but Reload Core will actually force updating the calendar