The Halo games side + main story were all around one of these categories. What's your guess?
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In one of the videos from ign (forgive me for not remembering which one) it was implied that the story would be fairly quick (I'm guessing the 8-10 hour range) but the end game content and gear grinds would be much longer than the story mode. If it's longer than 10 hours for story I would be very very happy but also surprised.