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I had some free time and played through a couple of turns on this amazing map. On recruit difficulty, it took 135 days on the first try, and I got the lich icon.
For those just starting, "Warrior" difficulty is suitable, and "Veteran" is good for harder difficulties. If anyone completes it on "Hero" difficulty, please provide proof.
I'll refine the ending cutscene and play this map on "Veteran" again. Thank you.
It turned out that I leveled up one main hero, who was Lady Marinka. The second hero was on guard duty and didn't have anyone to fight, but she managed to lure one gnome into the castle and had a great time.
Marinka got the following perks: sharpshooter, darkness (very helpful), attack, machines (not needed), defense, and morale. The lion set was useful in the early game for 2-3 months, then the dragon set was almost complete, and Sandro's cloak was very useful. The dragon set didn't have a cloak. That's all I remember.
Good luck to everyone playing the map! It's one of the few that you can't tear yourself away from.