How long will it take to see if plant is swag or chonic?

I can get my hands on some seeds from someone but they said some of them are swag and i wanted to plant a lot of them and take out the swag plant but i wanna know how long into growing them can u tell?

that is not a question that can be answered easily, since there are strains that look like the bomb when they grow, but don't smoke nearly as good. The same can be said for the opposite side of the spectrum.

mad reps ching