how much longer

how much longer untill i can tell the sex of the biggest plants here an i take new pix every mornin. An also I am in the 12/12 light state with the biggest ones well they all are but those are the reason for the 12/12

if your in veg stage you wont know for a while, once you flip your lights to 12/12 thats whene you need to start looking for thos F'ing males! .. lol... unless someone knows a technique i dont