how long does it take for..

you to recognize the female from a male and what are keys indications? i understand there are hairs on the female.

how long until those are visible and what are other key indications?

You need to switch them over to 12/12 lighting and in about 7-14 days they should show their sex. Males have balls females don't. You can just google marijuana sex and you'll get tons of pics. If you are still not sure just post a picture and the guys here will help you out. Good Luck

yeah your going to have to go to 12/12 for a week or two.
check this https://www.rollitup.org/view.php?pg=faq&cmd=category&id=53

it helped me figure out what sex my plants were.
once you go to 12/12 check them once or
twice a day, some of mine came within the first week.

good luck

read the faq light my fire.