it might take a 10 year old about a week or so
Depending on how you go about losing the weight, anywhere from 5-12lbs. If you want to do it healthily, it will take a bit longer.
weight is measured by calories, not time.
There are numerous websites that help with before and after weight. Most of them just take pictures before you start losing weight, then take pictures after you lost the weight so you can physically see how much weight you have lost.
Take her to the vet and find out WHY she lost so much weight. Forcing weight-gain is not going to solve the underlying problem.
as much time as you put the hard work effort sweat and capability
You won't get a six pack doing cardio. Look into weight lifting.
Throwing up after you eat (also called purging, a sign of the dangerous and potentially deadly eating disorder known as bulimia) is not safe and is not a good way to lose weight. I agree with the above answer, but I have done this before and I lost seven pounds in three days. However most of it is water weight and you will not look slimmer, and you will hit a point where you have lost all of your water weight and you can lose no more.
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Take him to see a vet for advice.
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How many days does it take Saturn the planet to orbit the sun? How many days does it take Saturn the planet to orbit the sun?
It depends how many days you will be trying to reach the desired weight. If you lost a half pound a day, meaning you expended 1800 calories more than you took in, then to lose 20 pounds, it'd take 20 x 2 = 40 days. It really, really depends.