Flowering times and thc content

Been thinking about all the differences in flowering times with different strains.Is there a list of strain flowering times ie: faster to slower times indoor/outdoor.
Another thing how do they determine thc content. Is there other ways to tell how potent your hard earned stash really is without smoking it.If you could calculate level of thc then viola.Showgirl

Most seedbanks will have an estimate of the different strains THC %

Not sure what ur looking for?

Are you asking if theres like a instrument, that can find out the THC content of the bud, after you grow it? I was wondering this question myself actually.

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