Talk:Dark Elixir Drill/@comment-176.205.64.218-20130308042420/@comment-207.157.17.253-20130311140752

well lets say it takes a day to upgrade, it is not producing anything during this time, so in this 24 hours on non production you are not producing anything, but after the ugrade you have a high rate of production, so the time of profitablitity is how long it take to get the resources you would have gotten if you had not chosen to upgrade