Flowering Is So Slow. One Strain Almost Done Flowering?

Well first of all wasup fellow growers. I have four clones- three of them I had in vegetative growth for less than two months. Those three were put to 12/12 everything seems fine good leads not a lot of yellow. One is mangokush(which is getting dense and Is covered with white hairs) the other two strains are a hybrid & indica these two have shown preflower but no real change. ? They are in smart pots
The other I got about two weeks before the rest went to 12/12 it is a indica, this one didn't grow tall but bushy and leafs are nice green but also just preflower. No progress?
They have been at 12/12 for almost 2months.
They are all in smart pots besides the mangokush

Wow I am having the same problem. I have a two different strains one sour diesel and one cherry slider. That's what I was told anyhow. But they've been 12/12 for seven weeks well the one I topped is six feet and getting fatter and fatter every day whereas the untopped 4 footer has quite a few pistils but no thickening as of yet. I'm debating letting the mature plant finish and chop the other to hurry and start a new crop of indica. Or harvest one and let the other finish. Don't know which would be a better idea but I've got about a month to figure it out and I'd like to hear what you decide.

lol! so your plants are just not flowering? im worried about my first grow now