[HMM IV OFF TOURNAMENT] The fourth stage of the John Van Canigem tournament

Yeah, I was thinking of leveling up a bit, equipping myself with potions, and then going straight for the quest artifacts. I'd have to generate a few semi-hidden spots, but just big enough to fit 2-3 heroes. After getting the artifact in the southwest, I'd run back to the Castle (where I'd already have a healer and a strong fighter), learn some spells, and then continue my green-tinted, unpleasant activities of killing creatures. At some point, I could also start focusing on Speed. The last two armies would obviously use attrition and graveyard tactics. If this approach worked, it would take about 9-10 days, assuming that in the fourth game, it might even be 7-8 days. But if my calculation is wrong (which is very possible, since I'm not very good at the fourth game, and I only had about 2 hours for reconnaissance), and it's not possible to break through like that, then I don't know. I could, of course, try to use the Staff of Illusions to cheat, but that would take a long time. I think the hideout + healer + combatant strategy would still lead to victory, I just don't know how many days it would take.
Although, maybe the developers came up with something very clever?