How long does it take to walk through the whole zoo

All day!

I usually spent my all day in the zoo, may be from 10 to 4:30... Because I'm making some pictures from everything...

Well also depends on pace you can rent the bikes or the scooters as well

Depends on how many animals you stop by and if you read the info boards. But if you just stroll by it might take you like maybe 2 to 2.5 hours