Very simple. Head to the center of the concourse, take the escalator down to the train, take the train (or walk, the concourses are roughly 1000 feet apart), back up, walk to the gate. The train is going to be faster than walking. (Maybe not faster than running!)
I'd allow maybe 10-15 minutes, it doesn't take long. If your gates are not out at the extreme ends, and if you're in a serious hurry, you can probably make gate to gate in 5+ minutes.
Fly, you fools! Fly!