"We've been able to see at what point he's been able to enter the situation and still be productive," Childress said Monday in an interview with ESPN's Rachel Nichols at the NFL owners meetings in Orlando, Fla. "Obviously with that as a known with a 40-year-old quarterback -- there wasn't a big book on that before we started, now we have at least a pamphlet -- we have an idea of where that's at."
Favre signed with the Vikings on Aug. 18 last year -- after the team had already broken its training camp in Mankato, Minn., and had already played its first preseason game.
Favre signed and then played three days later in the Vikings' second preseason game, against Kansas City.
"As a coach, you're a mother hen, you'd like him to be there for all of it," Childress said. "But I'm enough of a realist to know that's probably not going to be the case."
Childress visited Favre in Hattiesburg, Miss., early this month and said their talks did not focus on the upcoming season.
Childress said he didn't "think for a minute he's trying to hold us up. I think he's got to mull it all over and chew on it."
Vikings owner Zygi Wilf appears willing to let Favre set the pace, as well. He will reach out to Favre "in due time," according to the Minneapolis Star Tribune, but for now is remaining in the background as Childress keeps open the lines of communication.
"There were a lot of people who questioned us last year both with the decision of bringing him on board and him coming on so late, but it turned out to be a great decision," Wilf said at the owners' meetings, according to the Star Tribune. "We're looking forward to having him come back this year. We understand it could work either way, but certainly with the team that we have I would expect that he and everyone else is excited to come back to fight for a championship again."
Information from ESPN's Rachel Nichols was used in this report.