Past couple games I lose/win within 5 minutes. Is this intended?

Game time will vary notably depending on the skill level and experience of both players.

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Q u o t e:
Past couple games I lose/win within 5 minutes. Is this intended?

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I have won/lost a few games in this time frame, but my games tend to be more 8-10 minutes. I did have a pretty epic back and forth game over the weekend though that was like 15-20 minutes and my Ultralisks helped me win in the final push.