It really depends on what you are doing. Something like running burns more calories than sitting at a desk will. This will help lower calories by jogging or going to the gym everyday
How long it takes to burn off 3000 calories depends on the activity you choose and your size. If you select a moderate activity that burns off 200 calories an hour, it will take you 15 hours to burn off that many calories.
depends what your doing
3 hours
it depends on the type of beer and how much you drank
Well, since 1 pound equals about 3500 calories then it well take 3500 calories to burn it off, but DO NOT try to burn it all off in one day. You can become ill and possibly die from it.
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).
3500 calories = 1 pound
This is based on someone weighing 150 Pounds. Riding and Elliptical Bike at 12-14 Km/H for 17Mins will burn roughly 168 calories.
Depends mainly on how many calories you want to burn off. and how fit/heavy etc you are. Walking, maybe you can push the burn to 450 cals/hour at a decent incline.
More than a day
That would be impossible. 3500 calories in a pound of fat means you need to burn 35,000 calories in a week. An average person (150lbs, maybe) would burn off 10,500 calories if they ate nothing at all for a week.
If one burns off roughly one calorie per 20 steps, then it should take about 70,000 steps to burn off 3500 calories or 1 pound of body fat.