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Played it again, 6 months, 2 weeks, and 5 days, collected all the artifacts by the 5th month, 3rd week, spent the rest of the time collecting sulfur, even had to sell Hellspawn for sulfur :).
Found a bug: there's a gold mine above the first castle, guarded by manticores and demons with a cleaving sword; they always join you, and they were quite challenging for me :)
Cool map :) I've played it for the third or fourth time, and it's still fun :D
I really liked the map. I played as a Warrior and finished in 156 days. I'm looking forward to the sequel. Thank you very much to the author.