What "kind" of take down? And, what kind of 9mm? Field stripping for cleaning or detail stripping?
If you're talking about detail stripping (where you literally disassemble the entire gun), unless you've dropped it in water or maybe bought a really grungy gun, I can't imagine why you would ever need to do so.
If you're talking about simply breaking it down to it's major components (frame group, slide, barrel, etc), I only do that when I'm cleaning after firing.