Because of the extended air-drying approach and the oak becoming seasoned with sherry, it will take about 6 years from harvesting a tree to turning it into a cask deserving of maturing single malt whisky. While other distilleries will buy applied casks, The Macallan takes a way more holistic tactic. https://eduardowdfcn.spintheblog.com/31284839/5-simple-techniques-for-macallan-white-box