On a hostess/half-board charter a continental breakfast will be provided on the boat.
On skipper-only charters, most clients prefer to walk to a local bakery and grab some breakfast each morning. You’ll also have time while in port to have some cereal or cook some breakfast on the boat. It’s a good idea to ask the captain what time you will be departing the next morning. Generally it will be between 10am-12pm depending on the length of that days sail.