It's about half mile and takes about an hour for the regular tour. You will also have to walk up and down stairs. There is some standing and no place to sit on the tour at all. Others tours may be longer. Also, there are 2 small museums and grounds that you can walk around in, so that could add another half mile or so of walking if you choose to do those. There are benches around the garden and grounds though. Everything outside is on a paved path.
I think they say 2 miles, but feels more like a mile to me. There are a lot of stops, so there's definitely time to rest.
Yes, that is what the tour guide said (about half a mile) on ours too. But that is only for the Mansion Tour, not the Explore More.
Pretty sure it was 3ish miles but you would never realize it.
It's a pretty fair walking distance. You also climb up and down stairs, the flights of stairs are 13 steps.
Through the whole house
At the end of the first tour, we had walked (according to the tour guide) about half a mile.
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