My clones has been under a 12 / 12 day /nite for 11 days and still they
are not showing sex. how come?? how long does it take?

it will usually take AT LEAST TWO WEEKS to show but it all depends in the strain

__________________
"She eyes me like a pisces when I am weak
I've been locked inside your heart-shaped box for weeks
I was drawn into your magnet tar pit trap
I wish I could eat your cancer when you turn back" - Nirvana - Heart-Shaped Box
Check out my first grow!

http://boards.cannabis.com/indoor-growing/76484-my-first-grow-ever.html