Brett Favre says he's retiring after 20 years in the NFL. Favre, 41, sat out Minnesota's season-ending loss to the Lions on Sunday with a concussion. "I know it's time, and that's OK. It is," Favre said. "Again, I hold no regrets, and I can't think of too many players offhand that can walk away and say that. Individually and from a team standpoint, it was way more than I ever dreamed of." He knows that there will be doubters with his future of reserving his decision. "I don't know for me if it's ever easy," Favre said. "I'm sure throughout this year, the comment has been made that, 'We'll wait and see in August or September' and that's fine. It's time. I'm OK with it."