In a game between the Carolina Hurricanes and the Boston Bruins on January 6, 2018, there was an impressive stretch of play that lasted for 17 minutes and 35 seconds without a single whistle being blown.
Also
The longest NHL game to go without a whistle occurred on March 24, 1936, between the Detroit Red Wings and Montreal Maroons. The game went for 67 minutes and 30 seconds without a single whistle.