By default, I wear heels all the time while I'm completely alone. This means that I essentially wear them 20-21hrs a day on weekends and 9-10hrs on workdays on average (I only wear heels while in my room and while taking a shower but I also "cheat" a little because I've been sleeping in high heels for about 3 years now that's why those numbers are so high)
But yeah, I don't stand too much during that time - maybe 4-5% of that time is actually spent standing / walking in the heels, which isn't too much. One of my dreams for the future is to spend a week with my crush where we both wear high heels for a full 168 hours non-stop!!