If I visit for last admission, how long will I have in the attraction? Last admission is 1 hour before closing - therefore you would only have 1 hour to explore our attraction. Related articles When is SEA LIFE Manchester open? Do you currently offer Sleepover packages? How long does it take to go around SEA LIFE Manchester? What is a Standard Entry ticket and what's included? When is the quietest time to visit SEA LIFE Manchester?