destroerX;n6188 said:
i dont think have the time of building in wiki will be more produtive and if we have we need to calculate the time?? Can exist people that dont know how that is made and in my case i dont care about the time the building need to upgrade i care about resources i need
Just because you, personally, do not need to have this information, does not mean it wouldn't be useful for others. The building's time to upgrade is relevant, because it affects how many buildings you can put in your queue. It also affects the time before your resource building upgrades start paying themselves back, for example.
Build time, in general, is a useful thing to be able to know ahead of time (or at least calculate), as that way you can predict how long before you can actually use the building level that you have upgraded to. It's not necessarily important to know at a moment's glance, but the amount of guides and strategies that it would inform is quite large.