Thanks, I have no problems with calculating, but the experiment... on level 35 no chance to try e.g. cannoner, and also I'm not sure want to recruit a militia just for mesauring. Furthermore "mesauring" is not a reliable method: I'm always uncartain about process starting point---and what if the base duration and actual barrack level are coprime? ;-) So would be nice, if could have the exact timing anywhere.