=Lizard=
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The average game duration in Heroes 3 (regardless of the version) is 4-6 hours. Carefully read the entire detailed manual for HotA – it takes a maximum of 30 minutes. But these 30 minutes are incredibly challenging; it's better to spend hours (years) saying that there's "so much new stuff, some kind of incomprehensible nonsense, and it's too much effort to figure it out."