5/6 hours if you walk fast. I recommend 2 days to really enjoy it.
Took me and my girlfriend about 5 or 6 hours but we're slow walkers and had to double back to see a few exhibits
5 hours
We did 5 hours, and didn't cover quite a bit.
About 4 1/2 hours with the bus tour
4 hours
I'd make sure to take pretty much the whole day if you want to completely enjoy it without being rushed. 6 or so hours
3-5 hours, the free bus tour helps you see alot of the Zoo in general and pick out where to go
Around 6 hours if you take your time
Maybe 4 to 5 hours. It depends on how long you stop and observe
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