Once you have synced your calendar it will automatically publish your unbooked times to your listing calendar once a day.
You can also Manually Update your calendar by going to the share my calendar page on your listing.
The time of day and how long it takes for the automatic refresh will vary based on how many calendars are being added to the system at any given moment. You can view when your calendar will next refresh and decide if a Manual Update is preferred.
The time it takes for a manual update to complete will also vary on how many calendars are being synced. It could be relatively instantaneous and it could take up to 30 minutes if it's a high traffic moment for users adding or updating calendars.
A little background on why this feature works in this way (if you're curious):
When developing a solution for connecting renters to space based on availability, we carefully weighed the pros and cons of integrating with venue calendars. The huge positive to integration is we can serve many different types of venues and staffing situations across the arts field and nationwide. If we required venues to all use the same calendar we would be able to more easily offer "real-time" calendar data but participation across the field would be greatly limited. We encourage feedback on the topic of calendar update timing and will continue to monitor this feature.