I like the idea of that.... I might just have to do it !
5-minute freewrites are an awesome way to get a basic idea created (although admittedly I allow myself a couple of extra minutes, to compensate for the arthritis that makes my left hand type too many random characters !), but with just a few minutes you don't get time to really fill in all the nuance of the story or to develop it too far. I think this one definitely has pote3ntial to be turned into something longer....
All of my entries except for the first have been more than five minutes, but typically less than 30. I won't call them short stories, but perhaps story "sketches". I do enjoy the daily prompts though, it's been a good exercise to recultivate the habit of creative of writing.