@Lorna-Enriquez0
Not sure if this answers all your questions:
First, if your calendar is only open for the next 3 months, guests can stll email you and ask about future dates they just cant IB
Under your Availabilty Settings you can set bespoke date ranges where you decided the min and max number of nights a person must book during that period. THere are also standard seasons that you can choose.
I would start out with the longest period for a holiday season, say 2 weeks and if you are not gettin any business maybe reduce it to 10 days and then perhaps a week if still no response.