If someone makes a 3 month rental, I block the 3 months for them. Airbnb will only pay your cancellation policy. So if your tenant decides to leave 1 day before the 2nd month is due you cancel and take the rating hit and do not get paid for balance of the reservation read stories on this site about getting paid on airbnb guarantees. I lost close to 850.00 all documented on Airbnb for damages that 14 ambassadors promised me they would resolve.