A portion of a Game Informer interview general manager Philip Holt…
Game Informer: Can you recap the development timeline for taking Madden from scratch to store shelves for our readers?
Philip Holt: It’s between 10 and 12 months. As soon as we finish this year’s version (we usually wrap up in early July), the team takes a couple weeks off for vacation and comes back to work on early pre-production for the next game. Everybody who worked on the last title works on the next version; we don’t have a leapfrog team or anything like that.
Here is the original:
Madden 09 – interview

