For local harbor crossings like the Star Ferry, arriving just five to ten minutes before departure is usually more than enough time since departures are frequent and boarding is quick. However, for high-speed international or long-distance ferries heading to Macau or mainland China, passengers are strongly advised to arrive at least 45 to 60 minutes prior to departure. This extra time is essential to clear mandatory customs immigration checkpoints, go through baggage screening, and complete ticket verification.