Upper Allen Township and Keystone Marker Trust, a non-profit organization, have collaborated to restore the historic Shepherdstown Keystone Marker located on the Gettysburg Pike.
Each NHL game features 60 minutes of playing time, broken down into three 20-minute periods. The league also mandates a 17-minute intermission after the first and second periods to flood and ice and provide the players with a rest period.
Some leagues may eschew overtime periods altogether and end games in shootout should teams be tied at the end of regulation. In the three major North American professional hockey leagues (NHL, AHL, and ECHL), regular season overtime periods are played four on four for one five minute period.