When the chicken haches.You can't tell if the chick is growing by just whatching.To see if the egg is growing,hold it up to a bright light.If the egg is fertile,it will have a dark spot in the center indicating that tha chick is growing.If the egg is infertile,it will be somewhat clear(eat it).This practice is called candling.
It doesn't take very long.
about an hour
About 8 months for your average chicken to grow up.
Depending how big the chicken.
45mins
one minite
3.2
#3 Years
21-26 days
a fortnight
15 min
yes!