New to auto question

Hi AFN
Recently I decided to give Autoflowers a try. I've got 3 FastBuds GSC going for about 3 weeks now. Two are doing great...one got tall and lanky.
Anyway...I'm running in my veg tent right now at 20/4 but I'm needing space in my veg tent. I have room in my flower tent and was thinking of moving them over but they'd need to be at 12/12 with the photos I have in there.
My questions are:
Can autos flower under 12/12 but it will just take longer to finish? Will I lose a lot of yield by doing it?
Thanks

 

[AutoWonders]

Can autos flower under 12/12 but it will just take longer to finish? Will I lose a lot of yield by doing it?

They will grow in 12/12 but it will more than likely be a debilitated grow. It's difficult to say how much being only 3 weeks old. If 12/12 is what you have to do, go for it and try not to stress about it.