The date and time slot you select is for LEGOLAND Discovery Center, but you're welcome to visit SEA LIFE Michigan Aquarium either on the same day, as your visit to LEGOLAND Discovery Center either before or after you time slot. Or you can visit SEA LIFE within 30 days after your visit to LEGOLAND Discovery Center; but NOT the day before.
The average family spends 60-90 minutes at SEA LIFE and 2-3 hours at LEGOLAND Discovery Center. Please see each attraction's website for complete hours of operation.