Mikey and his mom went to the Natural Museum of History this weekend.  While he was there , he saw many wonderful things.  At the museum, they had old giant bones of dinosaurs, wonderful movies of them, and lots of other wonderful animals there as well.  They even had lions and tiger bones, and Mikey was thrilled.  He spent all day looking at wonderful sites of nature, and how beautiful God's creation is.  He learned about conservation, and taking care of our planet.  He learned about the earth, the water and ocean, and even the skies and planets.  While he was there, they had a shop that you could buy toys and cards in.  He bought a gift for his brother and dad. One of the gifts was a dinosaur for his brother, and his dad got a world cup for coffee. His mother and him ate lunch there, and they got to see a movie of dinosaurs. They had a wonderful time. 
Question: Why did they take so much time to see all of the museum?
It is large