That depends on several factors, but if you mean through exercise, well...that depends on several factors :-D
Essentially, the higher your heart rate during physical activity, the more calories you will burn. For example, sprinting 400 yards will burn more calories than jogging 400 yards. So how long it takes to burn the 600 calories will depend on how hard you are able/willing to work.
At a continuous, moderate running pace - assuming fairly average physical dimensions of the person - buring 600 calories should take about an hour.
You have to jog or run for a long time to burn that much.
10 hours for running, 35 hours for walking.
You can do 1000 jumping jacks or run 3 hours
you run and burn calories
yes
Run walk, go to gym all these exercises burn calories.
The best way for you to burn lots of calories while running is to run up hills or at an incline. If that is not an option you can also run up and down stairs those provides a lot of burn calories.
you burn nothing cause your fat
I guess you mean how long do you have to run to burn off 4000 KJ. Well first off 4000 KJ is equal to 955 food calories. Also, for every mile you run, you burn off an average of 100 calories along with it. Although the amount of calories burned all depends on age, sex, weight, temerature, terrain(hilly, offroad , ect), and also weather (windy, rainy, ect). If you do the math, you would have to run 9.55 miles to burn off 955 calories (4000KJ).
run!
As long as you are alive you are already burning calories. And the more physically active you are - the more you use your muscles - the more calories you burn. So how far you have to run depends on how many calories you are aiming to burn. Me, I'll use up about 1000 cals on a 6-mile run.
i run 7km in 40 minutes and i usually burn 500 calories or thereabouts. hope that helps. krups