Hello there!
First, I would like to inform you that the iCalendar synchronization is unavailable in the Lite version of our Hotel Booking plugin. So it would be necessary to get a premium version of the plugin to sync bookings.
As for the sync intervals, our plugin can fetch bookings at 15-minute intervals. However, it’s important to note that different platforms and OTAs such as Booking and Airbnb have their own synchronization schedules, which our plugin cannot control. Therefore, for information on how often they retrieve bookings from connected calendars, it’s best to check with those platforms directly.