Plant Sex!

so i really cant find a straight answer on this..
what is the quickest method and time of discovering the sex of my plant when beginning from seed?
also the smartest method form one of the vets that anyone could give me would be greatly appreciated, the advice ive gotten so far is great.

you can cut clones or you can wait till it pre flowers thats the method i use but no matter what you do the plant needs 12/12 to show sex. good luck

The quickest way is by ensuring your grow area is completly dark when you change over to 12/12 during lights out.

make sure your plants are also mature enough to flower as young plants take longer to show their gender.

Having healthy plants will also speed up sexing as a stressed plant can take a very long time to show gender.