girls: 2-3 months, maybe 4 if you have thin hair. men : 2 months maybe shorter
As long as it takes for your hair to grow back when you have a haircut.
it just depends on how fast your hair grows.
Normally yes, but if you happen to be dead at the time of the trimming of the hair then as long as you're dead, your hair will not grow back.
it grows back if you trim it a little once per month. Then your hair can grow faster and longer.
it depends how bad you grow your hair back maybe a week or two
If you do it now, it should be completely back by October or November.