For all those

Donovan McNabb

haters, consider this when it comes to playing Eagles rookie quarterback

Kevin Kolb

: Broncos second-year quarterback

Jay Cutler

endured his first full NFL season as a starter and came away with a harsh reality.

"It's a long season," Cutler told the Rocky Mountain News last week. "Last year, I got to sit and watch a little bit. This year was my first year since college. It was long, mentally and physically."

There is a monstrous learning curve, especially for a quarterback, at the professional level. It's not just digesting the playbook, either. It's a long season, and one that taxes the body and the mind.

Cutler started five games as a rookie last year. He'll make his 16th start of the season against the Vikings today, despite having a sore knee, which he injured against the Texans in Week 15.

For the year, Cutler has completed 63 percent of his passes for 3,251 yards, with 18 touchdowns and 14 interceptions. He's been sacked 26 times and fumbled 10 times, losing four of the fumbles. Since starting the season 2-0, the Broncos have won just four games.