Johan
Ex got M3 in the divorce, waiting for EU Model Y!
I'd think that courtesy between the Tesla owner's would make it uncommon to block a supercharger for many hours. Maybe a time limit of 45 minutes is sensible? You could probably program it so that the car senses that it's plugged in to a SC and when charging stops after 45 mins (or at least when fast charging stops and it just slowly fills up the last 10% to 90%) the charging cable lock mechanism could decouple so that another Tesla owner can unplug you. Though the car will still maybe be blocking physical acess to the supercharger?