I can't recall as I didn't do that. I would check the website (there must be one). General admission was reasonable, but when you're used to free museums it's a bit galing to pay. Museum is self explanatory. I was in the area one night and half a day, so nothing of note. it was a bit seedy and girlie bar type of places round there. Hope this is a teeny bit helpful.

The third floor, far opposite the gift shop, is used for changing exhibits. If closed, that means that a temporary exhibit was being mounted or dismounted. The ground floor also has a gallery used for temporary exhibits. Fourth floor (gold) and second floor (history dioramas and ship models) are permanent exhibits.

There is no time limit just explore at your pace. The ticket counter, you can purchase certain floors for seeing, I forget how many pesos it cost.