plant sex ---- oooh so good

I really just have a question; I am a newbie and my first bunch of plants are 6 weeks old (from germination in my ecogrower) and about 12 inches tall, do I put them on a 12/12 cycle to sex them? Or should I wait until they are 20 inches tall? Is there a rule of thumb for sexing? Do you wait, until a certain amount of time has elapsed or until the babies get to a certain height? I have read differing accounts on what is the right thing to do. And as we all know, we all do the right thing.

it all jsut depend on what you want. if you want bigger bud then veg alittle more. If you cant take the wait any longer go ahead and veg. they will double or even triple in size during flower. try lookin at the 7-9 node for preflower.

Thanks for the reply....but I am still not sure on how much longer I should wait. I do want big bud so time or size?