During the production of the army, a shorter time is shown than in reality.
For example, for recruits, the barracks show 2 minutes, and in fact, when I reload the game after 2 minutes, the bar continues to show production. Recruits added to the General suddenly disappear after reloading the page.

The actual production time of a unit for a recruit is 3 minutes. The same goes for the archer, that is, it shows something different than it actually is.
I do not have any other troops yet.