Our "Calendar Only" (iCal) syncing option involves the pulling (or importing) of information from external calendars (i.e. VRBO, Airbnb, etc) into your centralized MyVR calendar. Once the import sync is established, MyVR pulls this information on an hourly basis.
As iCal only deals with the pulling of information, our partners may pull calendar information at varying frequencies (i.e. every 3 hours, once a day, etc). The export sync sets up the connection so that partners may pull the information.
NOTE: MyVR does not have any control over the frequency that each partner pulls information. To find out a partner's frequency, inquire with the partner directly.