Original: The lockout lasted 310 days starting September 16, 2004, the day after the collective bargaining agreement (CBA) between the NHL and the NHL Players Association (NHLPA) that resolved the 1994 - 95 lockout expired.
Simplified: The lockout lasted 310 days starting September 16 2004, the day after the collective bargaining agreement (CBA) between the NHL and the NHL Players Association (NHLPA) that resolved the 1994 - 95 lockout expired.