It depends on how active you are and how much water you drink. usually around a month, but if you exercise and drink a lot of water, you could get it out within a week or under.
Your growing, so no your not skinny, your in good shape.
That would be average but a bit on the skinny side...
ur skinny
well im 13 and 5'4" and i weigh 108 im skinny :))
your just right
It's average.
An average of 15 years.
Yes you should weigh about 8 stone
I would not say that you are too skinny being 5'7" and 123 lbs. I personally am older but am also 5'7" and weigh about 127, which is a perfectly healthy weight for that height, that does not mean that I'm not skinny though, I'm one of the thinnest people I know and most people say that the first thing they notice about me is how skinny I am, but in those cases one needs to take into account that we live in a country that is suffering from obesity...
5 million years
One billion minutes is equal to about 1,901.3 years.
Skinny: Stereo-typical of small. Who really knows the exact definition of skinny? Although if you are under your age group weight average then you can consider yourself as skinny. Usually you judge a person by calling them skinny by their appearance. Get a very close friend who you know that you can trust, and you know that they'll tell the truth. Ask them 'Am I skinny'. Hopefully you'll get an answer that most 'strangers' would think of you.