How long was the longest NHL game ever played?

Regular season games are of a finite time limit in terms of actual playing time , so the longest games in NHL history are playoff games as they feature unlimited overtime until a winner is determined. The five longest games are as follows:

1. Mar. 24, 1936: 176:30 (Detroit over Montreal Maroons)

2. Apr. 3, 1933 : 164:46 ( Toronto over Boston)

3. Mar. 4, 2000 : 152:01 (Philadelphia over Pittsburgh)

4. Apr. 24, 2003 : 140:48 ( Anaheim over Dallas)

5. Apr. 24, 1996 : 139:15 ( Pittsburgh over Washington)