Yes they are very comfortable and would stand up to walking miles. I wear them a lot but not for long walks.
Dd wore them constantly on a school trip to France this summer. They did a lot of sightseeing and she said they weren’t very supportive and got sore ankles after the second day.
Would you be better off with something more like a light trainer or a sandle? They are amazing and I wear mine as much as possible. They are very flat which doesn’t suit everyone but it suits me.