really, a SC2 game takes 5-15mins on average. it's 40% less than the time stated on score screens because it's played on 'faster' mode. i really suggest bo3 out of group stages, it's completely possible to finish it within a day(as shown in previous sg lan tournys by hdphoenix).
hope you'll consider it and do the right thing!
Totally agree with muse. A Bo3 doesnt takes much time in a lan setting. As long as it is well organized and players play their matches in time. A Bo1 is too random and allows a lesser skilled player to beat a much high skilled player with cheese.
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