It took us about an hour to do the discovery tour
It depends on the group you are with. If they stop to pose for pictures a lot then it coukd take 2 hours.
75 mins
2 hours
It also depends on what kind of your you buy! It could 2-3 hrs total.. wear good walking shoes ...
From one hour to two hours
People will be taking a lot of pictures, and asking a lot of questions, so just under 2hrs. It was awesome either way. (don't wear flip flops)
About 90 minutes
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