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The offer runs until 31 December 2016, and you should note that you can earn a maximum of 8,000 points per stay (in other words you’ll earn the bonus HHonors points for the first 4 nights only).
According to the terms and conditions, you need to allow six to eight weeks from completion of your stay for the points to appear in your Hilton HHonors account. However based on my experience I’d expect them to land substantially sooner than that.
As with any offer like this, I strongly suggest you just register for it now regardless of whether you have any plans to stay at a Conrad or Waldorf Astoria by the end of the year. I have lost count of the number of times random bonus points have landed in my loyalty scheme accounts from a promotion I had forgotten I’d signed up for. All part of getting into the habit of securing extra points!