An amenity can be set up to restrict residents from booking too far into the future.
First, go to your amenity and edit it in the 1CONNECT Portal. Find the section called "Set booking limitations", and locate the "Limit bookings in advance" toggle. Enter the maximum number of days in the input box. For example, if 30 days is entered, this means a resident will not be able to book this amenity more than 30 days in to the future.