It depends on how much you want to explore it. At least a couple of hours, but you could spend an afternoon there
That depends on how leisurely a time you want to spend. You could stroll all the gardens in under an hour or you could take your time and explore the grounds for 2-3 hours. They have seasonal displays of flowers so there are lilac bushes in spring and rose gardens in summer. Just wander around and see what you can find. It's really pretty there.
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