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Lately, I prefer to generate a similar hero and army (2-3 minutes) and then battle in the sandbox mode (5-15 minutes). This is because the number of troops, stats, and magic have a significant impact. Moreover, the AI sometimes hesitates – not knowing which target to attack, and even its counter-attack can be intimidating, making it want to consume more resources. So, it's best to replay a successful battle once or twice.