I've seen the whole thing in about 2 hours, and I've taken 6 hours. It depends on many variables, group size, how fast you move on from Each Attraction. It depends on how crowded the zoo actually is.
It really depends on how long it takes you to walk. You may walk through There quite fast and look at the animals quickly and enjoy the scenery. You may ask the people that work there how long it may take to go from one main exhibit to another exhibit. They have a good approximation of the time that it takes.
Depends on how fast or slow you walk. If you're walking with small children, you can be walk the zoo in 4-6 hours.
About 3-4 hours
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