I put in an hour of working standing up in my 12cm stiletto boots. It was a challenge in a couple ways, not least of which was the extra height it gave me, which made my kitchen counter feel awfully low and so rather awkward to write at my laptop.
on the brighter side, standing in them for an hour was a great way to become used to the height, steeper angle and to develop the balance needed to walk gracefully in them. It’s not putting in the miles like @mlroseplant but I think it will be useful. I certainly felt it in my calves after an hour of standing in those boots!