According to Official Guinness Records,
The fastest time for opening 300 bottles of beer by a team of three, is 1 min 47 sec, led by Alois Unertl, of the Unertl Brewery on the set of Guinness - Die Show Der Rekorde, in Munich, Germany, on 2 April 1999. In relay style, each team member opened 100 bottles and when finished, passed the specially constructed opener for the next team member to begin more bottle-opening.
For a complete list of 1999 records, please visit 1999 Guinness Records in Germany.