Bookings can be limited to a maximum of 365 days in advance.
If no limit is set, Airbnb can accept up to 2 years in advance of data and will show up to 4 years availability at the default price on their calendar. Bookings for dates with no availability will be rejected.
If you set to send more than 365 days in advance Airbnb might use your "rack rate" as a backup price for bookings long in advance. We recommend you make sure it is not set too low.