How Long For Preflowers to Show?

I have 7 plants growing all about 6 to 8 inches tall. Im growing in a stealth freezer i built. Please check out here for pics of the freezer:::
https://www.rollitup.org/grow-journals/78629-i-fixed-my-freezer.html

I am gonna scrog these and the screen is at 10 inches.
How can I see which are male before they hit the screen?
I grew 24 hours a day for the first 2 weeks and its been on 18/6 for about 3 days now. And i just put in a 400w hps a week ago.

Please help

could take up to 2 months. you should start to see pre flowers once they are 12 nodes tall.

so go ahead a train them to the screen?
and remove later?

Breece99 said:

so go ahead a train them to the screen?
and remove later?

Click to expand...

now i see the question. hhhhmmmmm, good question too. i think that's about all you can do.

that sucks!! Cause i know that will be difficult. I guess next time ill get femmed sedds.

once they are flowering, wait until 30 days in and then take a clone... then youll be set forever!

I get preflowers at about a month. although some strains just take longer.

Never not seen them at two months though, it also depends if you mean outdoors or indo