If I have not cocked up my maths, I am on day 42 of flower and my tallest white widow is about 55" tall, under a 250w HPS, regular pot ups, BioBizz nutes and no training or topping. I put them into 12/12 when they were about 6 weeks from seed; they were maybe about a foot and a half tall. The others are not that far behind my tall girl, including the one that I topped. You can take a browse through my grow log, I have loads of photos if you are curious.

I would allow for about 3x their growth for flower. I think White Widows respond well to supercropping, so if you get yourself into a bind with space in the first few weeks of flower (when you see the truly insane rate of growth) you can bend the stem over and they tolerate the cruelty for it. They are good plants. :jointsmile: