The Eagles have soared so far this season, especially in the second half.
The 49ers would prefer to stick with 30-minute games.
When Philadelphia visits San Francisco on Sunday, it will be a matchup of resilience against retreat. The Eagles have rallied to win all of their games, trailing by 17 points in each of the first two, and 10 last week. No team had made those kinds of comeback in the first three games of a season.
"One thing I stated to our coaches at the beginning of the year ... the only thing you didn't know going into the season is how would they handle adversity," coach Chip Kelly said. "And I think they handled it very well. No one blinked. No one flinches when we get in the situations that we've been in in the first three games. They know we've got to play a full 60 minutes."
The Niners know that, too. Problem is, they've failed miserably at it. San Francisco has outscored opponents 59-16 in the first half. It's been pummeled 52-3 in the second half in going 1-2.
"We have the guys to do anything we want," receiver Stevie Johnson said. "We just have to do it for four quarters. The past couple of weeks have been a tale of two halves. We have to play two halves instead of one."