When is SEA LIFE Brighton open? Opening times at SEA LIFE Brighton vary throughout out the year. For our opening times, including last admission times, please click here. We advise 1.5 - 2 hours for your visit. Related articles If I arrive at last entry will I still have enough time to view the whole attraction? When are quieter times to visit SEA LIFE Brighton? Why do I need to book a time slot? How does the time slot system work? How do I contact your Customer Services team? How can I get to SEA LIFE Brighton by car?