We limit our recommendations to 4 months in advance because we want our price suggestions to be as accurate as possible. Demand is changing continuously, and more than 4 more in advance is too uncertain. Also, some events in your area may arise that impact on your area occupancy.
That's why we recommend our users to block their calendars 3 months in advance, something that currently is being done by 25% of Airbnb hosts.
Bookings are made 22 days in advance as average. A very small percentage of bookings are made with more than 3 months in advance, and those are almost always related to high demand dates in which you, the host, are most likely to have a lower than recommended price.
We see that there is rarely any gain in having your calendar opened more than 3 months, and almost always a reservation at a price too low.