Two of my three plans show no signs of flowering, ...

My most longest vegged auto stain was Lemonade OG . One vegged 5 weeks, other 6.5 and third took almost 9. But thats anomaly, with FB i still had adrifft, its seeds, you will always have, plus ruderalis involved, so one more lottery factor ... Normally its not more than 2 weeks. Soon they will feel mature and will start to bloom.

Seeds are not clones, sometimes they are different, much like how siblings are not identical they all have their own features. They will flower when they are ready and that one is just delayed. So every seed from the same plant is just like that, plus as its not an photoperiod they don’t have a common trigger for flowering. Only thing you can do is wait, its part of growing autos and how they can be unpredictable. I agree with hashy’s assessment that 24/0 is to much, i like 18/6 myself but 20/4 can work. Good Luck!

Patience my friend! They will start flowering soon! Merry Cristmas buddy! 💚

You are only in week five so don't stress yet. Still lots of chance. When you get to week 7 then it may be strange. As a last resort at week8 + you could change lights to 12/12 but I doubt that's needed. Just be patient