If we do a public Menorah lighting in a bowling alley, or any other event, how long do the candles have to burn to in order to make a Bracha on the lighting? How many Jews need to be present in order to light with a Brachah? 

  Half hour. Ten Jews must be present when lighting in order to make a Brachah.   ראה בלוח יומי לחנוכה השקו”ט אם צ”ל עשרה בעת הברכה. וטוב שיהיו כבר…

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