It would take 7 weeks. Though when trying to gain weight the same principles tend to apply as losing it. I.E. Try to gain about a pound a week.
a 150 pound person sleeping for 8 hours burns 489 calories.
a 150 pound person burns 352 calories per hour walking on crutches, a 180 pound person burns 409. http://www.livestrong.com/article/320780-calories-burned-on-crutches/
You consume about 3,500 calories in 1 pound of your own body fat.
1500 calories burns one pound !
This activity burns approximately 296 calories per hour for an average 145 pound person
3,500 more than you consume on a dialy average.
The relationship of calorie consumption and calories burned is the following (kind of in depth): The calories you eat are obviously the calories you consume, right? Right. The calories you burn are, well, the calories you burn. If you consume 1,000 calories, but your body burns (oh say, 2,000 calories for sake of arguement) then you will easily not be affected weight-wise by the food. However, if you consume (eat) 5,000 calories, then you're going to put on a few pounds. 3,500 calories = a pound.
I think you mean how much exercise burns off 1 pound, because calories make up fat, calories do not burn the fat. Calories are something you do not want too much of.
Being active burns calories. For every 3500 calories you burn more than you consume, you will lose one pound. It also helps you gain muscle which will speed up your metabolism.
If you consume 3,500 calories then yeah
2000
25 minutes of steady-state treadmill running at 5 miles per hour = 256 calories