1 season, the 2008 season.
One season - 2008.
Brett Favre played 20 seasons in the NFL (1991-2010).
...he's still there.
In short, the Green Bay Packers (3/6/08) and the New York Jets (2/12/09). He has contemplated retirement many times, and is known for having much off-season drama, more commonly known as the "Favre Drama."Brett Favre retired from the Green Bay Packers first on March 6th, 2008. That was his first official retirement, even though he had two previous years where retirement was previously considered.He then joined the New York Jets on August 7th, 2008, after being traded from the Packers. After a season where the Jets barely missed the playoffs, Brett Favre retires for a second time from the New York Jets on February 12th, 2009.On August 18th, 2009, Brett Favre officially signs with the Minnesota Vikings, the arch rivals of his long time team the Green Bay Packers. He has since led them to an NFC championship game against the New Orleans Saints, and as of January 24th, 2010, is still playing for the Vikings.View the related link below for a timeline of many consecutive summers of Brett Favre drama, from the contemplation of retirement from the Green Bay Packers to the sudden signing with the Minnesota Vikings.
Favre was on the Falcons roster for one season, 1991.
He should play as long as he like and as long he has fans.
that person was old when he retired
He retired after his 2nd year with the vikings.