Flipping mine when they show sex as early as that may be. Usually when the nodes start to offset.I flipped H2 early only because 2 spots opened up in my 3 X 3 due to 2 out of 3 regs being male. I was going to cull her seeing she was smaller than H1 and H3(they will get flipped soon) but I was like what the hell, let me try H.A.F.'s approach and see what kind of results I can get with a 25 day veg and 50-60+ day flower. I bet it turns out to be better than any auto I have ever run and if it does I highly doubt I will ever run another auto again. Well, unless H drops some new Mac X Lemon Tree auto beans. Or if I grow a sack and score sum of those auto beans off of blu tri which I have a sneaking suspicion he dips in bath salts.