At the very beginning, I meant either the end of the first week or the start of the second. The moment when La Discorde first appears near us.

Regarding repeatedly buying the same hero in one day. I used this on this map to kill the strongest of the Four Horsemen of the Apocalypse, bound by the Chains of War, and save a few in-game weeks, but this tactic certainly doesn't make the player honorable.

And about not killing a key hero for the scenario when you can do it at any time. It doesn't seem like normal gameplay :)

Added 2 minutes later
But I also liked the map overall, even though I couldn't complete it, despite killing all the AI opponents on the map except for the inaccessible angelic castle.