As long as you don't have animals decide to take a break from walking right in the path of the vehicles... Or zebras who can't decide which side of the "road" they want to be on... It might take longer then because it is totally at the animal's discretion as to when to move...or pick a side.
We had about a 20 minute giraffic jam. We enjoyed being close to the giraffes and watching them until the keepers were able to lure them away with food but it does make it tough to know for sure how long it will be.
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