I am just trying to say that if we are having 2 builders, and we want to upgrade our gold storage from level 9 to level 10. Usually it takes 1 day. But if we are not having any thing to upgrade. So all the builders are free. If we introduce a update that we use our both the builders and the total time of upgrading should be minimized .... So it akes less time (if u r having more than 2 builders then the time must be calculated accordingly.) So plz think about the update.

