when was the first nfl lockout and for how long
The 2011 NFL lockout was the only major lockout in NFL history, but there was a very brief lockout in 1970 as well.
The 1970 lockout occurred due to a minor disagreement between owners and players about the union, salaries, and how bargaining would be done. There was a brief two-day strike that occurred as a reaction to the lockout.
There was a strike that lasted a little over a month in 1974. The 1974 strike didn't affect the season and was caused by the players' disagreement with the "Rozelle Rule."
The two biggest players' strikes occurred in 1982 and 1987. The 1982 strike lasted 57 days and cut the season down from 16 games to 9 games. The 1987 strike lasted 24 days and only cut the season down by 1 game, to 15 games overall. Both of these strikes were mostly caused by the players demanding higher salaries.
The 2011 NFL lockout lasted from March 11, 2011 to July 25, 2011. The lockout occurred because the players and owners couldn't agree on a new collective bargaining agreement. The lockout was a work stoppage imposed by the owners of all 32 NFL teams. The 2011 lockout ended before the season began, so it only affected the offseason.