Web world of law online

I live in a two room apartment and I have doubts that if I were doing anything other than just sitting in my front room watching TV that I'd be able to get to the door within 15-20 seconds. In my old apartment where I had three rooms and did not use the front room there's no way I would have made it. On top of that one suspects that in the real world police, more concerned with officer safety and the preservation of evidence than constitutional niceties, probably do most of these home invasions at early hours with the expectation of catching people in bed, yelling in their best stage whisper "Police, open up!", and rapping on the door as hard as one can with the tip of one's pinky.