It takes as long as you want to wander around the island but allow at least 3 hours
3 hours if you take your time.
3 hours if your going at reasonable pace. Plenty of time to stop and take pictures and explore grounds
As long or as short as you choose Just the audio around 2 hours However you can spend all day on the island if you choose
If you go just audio tour, you can be done in 2hrs.
I would budget 3-4 hours. You can leave whenever you want the ferry runs every 30 mins
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