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 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? Can I redeem a promotional voucher online? What are you Social Media pages? How do I give feedback on my visit or experience?