I go out around 4am and head to the gym. When I leave for work @ 7am I don't have anything else to do.. car is still clean.
Steps 1 - 5: under 10 seconds
Steps 6 - 8: 1 minute MAX. (takes a lot less time to spray all my windows and squeegee the melted ice off than it would take for anyone to scrape away helplessly at their windows... in which point it'd still have patches of ice on it.).. 2 minutes being the maximum time if I also have to clean fallen snow off the car, and there's ice waiting for me underneath.
Steps 9 - 11: no time.. I'm already on my way to the gym.. and my windows are as clean as if it were summer.