Google Calendar Quota

From FAQ

The Google Calendar API has several quotas for all users.

What uses the quota:

  • Creating events
  • Deleting events
  • Polling for new events

I cannot shorten the Calendar polling interval because if I have 100,000 users the extension would only be able to check for new events 10 times per day per user! Since I actually have much more than 400,000 users and they also create and delete events, I had to make a special request to Google to increase my quota and only for me. Increasing this quota again may require me to pay Google a monthly fee.