Trainwreck, how big does it get in flower?

I'm currently flowering 2 plants, both bagseed, one unknown the other from a bag of Trainwreck. So in 2.5 weeks the lady has almost doubled her height, from 16 to 30 inches. How much more stretch should I expect out of her? My setup isn't really able to handle her more than doubling her height so now I'm scrambling to get the roof of my grow cab extended. Anyone grown Trainwreck that can give me an idea what to expect?

you better try and tie her down a bit if i was you mate, i topped mine to get 8 colas and then lst'd the shit out of her so she was only a vouple inches tall but covering the 5 gallon pot and when i switched to 12/12 in 3 weeks she grew to 35 inches!!!!

Is topping during flowering a good idea? (I'm not sure, I'm going to look into that) I do know that if you lst it, basically just bend it over almost 90 degrees and tie it down during flowering it wont hurt the plant. This will make it half the size it is now or smaller, and give the plants some room to stretch during the flowering period.

Thanks you two. I will look into tying it down, too much of a noob and have no experience with lst.