How long will an opened bottle of whisky last while stored under ideal conditions? I've recently made the decision to put my whisky collection into storage and slow down my drinking habit.

Assuming I keep the bottles under moderate temperature, and out of sunlight, is there a ballpark figure to how long they'll remain palatable?

More specifically, I'm interested in real numbers, and not just 'a long time'.
Whisky will never go bad after it's opened and kept closed and away from sunlight.


  How should I store my Scotch Whisky? Unlike wine, whisky does not mature in the bottle. So even if you keep a 12 year old
  bottle for 100 years, it will always remain a 12 year old whisky. As
  long as the bottle is kept out of direct sunlight, the Scotch Whisky
  will neither improve nor deteriorate, even if it is opened. Whisky
  that is stored at very low temperatures can become cloudy, but the
  cloudiness should disappear when the whisky is returned to room
  temperature.