Hey dude, a few variables to consider. Barney's vs Big Buddha vs will be different, as will every other companies version.
I have experience with BBBC and she's one of my all time favourite, kept a clone of her going for three years til i packed growing in.
But again even within the brand there's going to be variety. The different phenos I saw out of twenty odd beans were Indica Dom, sat Dom, and an in betweener.
The sat Dom flipped at 12" went to 39" and the Indica Dom 28".
Best bet is to look at the leaves and judge what type you're plant is and you'll know what end of the scale your on