So I got these 4 autos and 40 days later after a week of bloom nutes they are showing sex all over but no flowers or white hairs appeared anywhere. Lights 18/6 to 20/4. Gave them a few shorter light time time these last 2 days 15/9 now switching to 12/12 plants are small the biggest is about 10 inches. The others hang out at around 6 or 8 inches. Lots of top sites nearly 20 in total on each. Auto bubble gum,auto white widow,auto jack herer, auto, og kush. All though all these little ladies look identical in leaf structure. What have appeared to be pistols popping through have open up to leaves the next day lots of leaves I tell ya I’m not farming leaves lol. These 4 were also fimmed at around day 14
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Pictures would help a lot, but it sounds like they were stunted when you topped and fimmed them. There’s a small window for autos on when they can be topped and if you miss it, you can stunt your plants, which sounds like it might be the case here 
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Maybe that’s a possibility
You should not be Fimming autos. Stresses them out and Stunts growth and yield…but feel your pain. I have autos in DWC that took 11weeks to finally show pistils. Previously under a weak light I went 4 months and yielded only grams. Drop to 12/12. Also what nutes are you using? Lighting?
Having a auto go more than 11-13 weeks seemed a bit far fetched. And under weak lights I wouldn’t expect but a few grams. That’s not the case in this one.
Look at the time stamps. And I have a 4xQB304 lighting setup as well. There is something about DWC that keeps the plants fat and happy that they just don’t turn. I’m trying to figure it out myself but think it has something to do with Phos/Pot(K) or something else they need to flip.
Are we talking photos or auto’s…?
Auto’s will do what ever they want… you might need to go to 48 hours darkness and then 12/12 or 11/11 to keep them in flower even if they are auto’s… 
Sometimes even 10/10… plants grow more in the dark , then in the light …
They just build blocks in the light , but they put them together in the dark…
But really , it has to do with hormones and life cycle… when we start to alter things when breeding seed’s … theres always a chance that you will have to push things to the extremes to get the outcome that you want… you just need to figure out how much to push things…
That’s why I only grow photos… I can make them do what I want , when I want…
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Auto flower dwc talk
There is evidence that the type of nutes given will prolong veg periods. @Screwauger has a nice write up on it.
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Do you have the original packaging they came in with the code on them? You have photos, not autos.
Key word here IS " patience " MY FRIEND
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21 weeks. That is what I’m predicting form mine also. DWC. Amnesia Haze Auto and Northern Lights Auto.