PICTURES: 13 Ridiculous Ways to Burn Off Lunch

(CBS) You just grabbed a quick lunch and are heading back home or to work when it occurs to you:

How long will it take to burn off those calories you just consumed?

PICTURES: 13 Calorie-Burning Activities

The answer, of course, depends on your weight and activity level. But it could be a lot longer than you realize.

Even if you eat something relatively healthy, like that Subway six-inch oven roasted chicken sandwich you just gobbled, and then washed down with a soda.

Here's the math:

Sandwich, 320 calories. Soda, about 150 calories. Total calories, 470.

And here's how long it would take, activity by activity.