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3 months minimum.
depends what excersie ur doin and how much your eating but if your 13 you shouldn't need to lose weight you should be young and fit
Many people, especially women, are trying to lose weight these days. There is a website that I find very informational: http://exercise.about.com/cs/weightloss/a/howtoloseweight.htm
You need to be at least 100 lbs overweight and have tried many other options to lose weight. You can also see a nutritionist to get help losing weight.
For extereme weight, best to get personal medical advice.
350000 a week
1200
zero
5X20
as much time as you put the hard work effort sweat and capability
Probably, if you are not consuming as many calories as usual.
As much as you can! The more the better