We don't restrict how long in advance you can book. Booking more than 2 months in advance is probably not necessary if you are only worried we will be full. Typically even before Christmas or August long weekend, we only fill up less than 2 weeks ahead. You are welcome to do what you like though, because we send out a boarding reminder a few days ahead. That way even if you have forgotten about it and your plans have changed, you can still change or cancel online.