Well it's a Prohormone to trenbolone, so 12 weeks is not impossible, but likely the max if health is any concern (there are guys that use trenbolone way longer still).
IMEE (in my extensive experience) you should not expect to reach supraphysiological levels of testosterone using 4-AD. Much like endogenous testosterone your body begins recognizing the higher levels as a result of 4-AD and begins to aromatize and metabolize it in a way that prevents gains that...
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