If your Schedule and Streamer is enabled, Calendars will update multiple times a day. The Streamer will look for updates about every 30–40min and push any updates it finds. You can check for the synced results by doing the following:

1. Scroll down on the main dashboard until you see the mailbox list.
2. Find the user you want to check on.
3. Right click on their name.
4. Click View Sync Results.
5. Click Calendar.