Approximately 54 days . Do you think they are ready or should I wait before switching the lights ? Some of them are 4"-6" above the screen . Screen is adjustable .
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I would flip switch they do grow quite a lot during flower too much bigger and you will need extra screen
@Donaldj ,I figured they were close to flipping . I have 28 " of room left for growth . It’s going to be tight in the tent . I just might add another screen for stability later if needed . Lights are now on 6:00 am -12:00 . What time should I start the 12-12 ?
anytime that works for you it is only a 1 time disruption it makes little difference when the light change happens I don’t even change schedule I move plant into flower space and after first day they are on 12/12 cycle 
I’d leave them off for a full day, then start 12/12 at 6 am the following day.
@3high5you I have heard of people doing that . I guess that helps to trigger them to change .
I’d definitely flip them. You may find it hard to find spaces to tuck once they start stretching. I ran out of space on one of mine and I wasn’t nearly as far along as you when I flipped.
Regarding the 24 dark, I haven’t seen any evidence one way or another on it. I wound up doing it but only because my electronic timer malfunctioned!
They look great, btw.
I had one bag seed plant that was smaller than the others and I waited for it to catch up and reach the screen . I’ve decided to not go 24 hours dark . It’s going to get crowded in there .Chronic Widow branches looks good . Then there is " Weirdo " . Lights were cut back today .
@nostril , @3high5you I flipped the lights to 12 - 12 10 days ago . Things are looking good .
Looking good! Enjoy! 
The picture of the one under the LED is NOT a Chronic Widow . fyi
Pretty gals you have there! Whatever you’re doing keep it up
@MattyBear, Nothing fancy here , just twice a day visits to monitor air temperature , RH and give them a drink . The only thing I would do different would be 3 plants instead of 4 . 2X4X5 tent .The screen filled up nicely with four , it’s just hard to reach the plant in the back to trim and maintain branches .
Gonna have some nice fat buds there bud
@MattyBear, @Nug-bug , @3high5you , He are 2 phone close up photos from the scrog . The new magnifier , FF soil and other goodies are on there way from Amazon . Getting ready to drop two more Chronic Widows for scrog #2 .
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Looking great @Seeddog.