Talk:Constructor/@comment-75.20.149.41-20130217040815/@comment-76.99.59.134-20130218061142

building up to lvl 10(included) takes 232h and gives you 4.5% reduction.

This 232 can be recovered in 214days from the 4.5% you will get  from time reduction from other buildings.

So yes, as it is now, is preety useless.