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And a glass of warm milk :) There are no problems with letting the computer run away, but the problem is that it only appears in week 5-6, or did you manage to lure it earlier? For the 20th defense, you also need a shield against the blue hero, which also doesn't appear that early.
If you're going to focus on generating a specific month and recruiting snakes, then these recruitments are more useful for a starting attack. In this case, it's not at all certain that starting with bulls will be faster, as you get a one-shot attack from snakes with bless. At one time, the question was raised about generating the desired week/month of the monster, but I abandoned this to show that the map can be completed even without the option, which is disabled in HD+.
In fact, these borderline moments with the month of the monster and the random computer were some of the reasons for limiting it to 1 month for my task. In reality, the task can be reduced to 3 weeks with the construction of a prefecture, wyverns, and bulls in the castle. And yes, it's a completely different game plan and a much more interesting task.