Completely agree with the previous posters. Even at morning "rush hour" it's typically a breeze. Now I'm going through the "elite" line on the South side where the whole process takes no more than 10 minutes. But even looking over at the non-elite line, it's moving smoothly too.
With a flight at 11:00--after the morning rush--it should't take much time at all. I agree 20-25 minutes max.