If I spent 20-30 minutes in the shower, I'd be late for work. I think I take about 5 minutes. From the time that my alarm goes off until I'm sitting at my desk is about 45 minutes...

For what it's worth, my house is around 70 degrees F and the temperature of my shower water is about 105 degrees F. And as soon as I get out I have to dry myself off to keep from getting a chill.