First, we see a lot of guests, often first time charterers, applying the concepts from vacation/villa rentals to yacht charters.
Waiting for the last minute deal is not a good idea (the chance you’ll get the type of boat, port, and budget on your dates is minimal).
Yacht charters are a seller’s market. The best yachts are usually booked 6 months+ in advance.
1 year ahead makes it possible to select from almost all yachts available (there are charters for Summer/Winter 2020 being signed late 2018).
With 1 year ahead, there is plenty of time to make a decision. With 3 months ahead, there are often situations, where the group communicates about a particular yacht or multiple yachts for a few days. Finally, when ready to place an option, the yacht is no longer available (placing an option is usually for the purpose of signing the contract, not making a decision).