Basically, on day 343, I killed the red and blue factions and repelled the barbarians. After that, it becomes boring, just sitting around and gathering resources, monitoring the timing of the green and brown factions' arrival, then using save-loads to ensure that armies from all castles arrive for their attack, and then defending against them in the castle. After surviving the first waves of the brown and green factions, you can already go to the Inferno respawn point, but I've already done all of this in other playthroughs on lower difficulties. Therefore, there's no real challenge for me to complete this map, and I'll end the playthrough here:)
Basically, I've been playing carelessly since the second month, and I've lost all my gnolls, so the timings can probably be sped up, although I don't think there's much point in doing so. The first month was still quite interesting because of the resource situation and the initial setup, but the current progress doesn't pose any significant difficulties for me (this is also evident from the fact that I first saw this map in the middle of this week).
This map isn't difficult, but it's tedious, like calculating the discriminant of a 5th-order matrix.