In order to be considered fully vaccinated, a guest must have received their last dose in their vaccine series no less than 14 full days before their sail date. The 14-day period starts the day you get your last dose — that’s Day 1. After 14 days pass, you can get onboard on Day 15. For example, if you received your final dose on September 1st, your 14-day countdown starts on September 1st, and you would be permitted to board the ship on September 15th or later.