And now he's saying seven seasons:

http://www.deadline.com/2011/04/netflix-pacts-with-lionsgate-to-stream-mad-men/

 Quote:
After entering the original programming arena recently with the David Fincher/Kevin Spacey series House of Cards, online streaming giant Netflix is now entering another area previously reserved for TV networks, off-network syndication. Netflix has signed an exclusive syndication deal with Mad Men producer Lionsgate to stream up to seven seasons of the Emmy-winning AMC drama. Under the pact, the first four seasons of Mad Men will be available on Netflix's Watch Instantly service beginning on July 27. Additional seasons will be added as they finish airing on AMC. The news comes days after AMC officially renewed Mad Men for 2 more seasons and Lionsgate TV locked in Mad Men creator Matt Weiner for three more years, effectively assuring that Mad Men would go to 7 seasons.


November 6th, 2012: Americas new Independence Day.