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