Is the dinosaur exhibit open all day until closing? Or does it close a little more earlier??-

We had went to the museum but couldn't get to that exhibit because we had no idea where we where going and there was something going on in the second floor

I visited last week and all dinosaur halls were open including Titanosaur.

Usually it's open all day but last time I visited (about a month ago) the Titanosaur exhibit was closed. I'm not sure if it's open again. The dinosaur exhibit hall was open.