According to Fred Laing himself in a video posted on the launch day, he said those casks have only 40-80 bottles residue and may be leaking casks. He said they are good whiskies though.
It acatually took about 30 to 40 minutes to sell out all 6. However, the first one sold out sometime between 10 and 15 minutes -- it was the 24yo. I would have expected the oldest to go first, like ...