The last time I spoke with Bill Llewellyn, I was told 1-test has a half-life of 10 days.. I'm not sure if this was in regards to detection,(which I don't think would make sense, since 1-test is close to chemical relation to dht, which is an undetectable AAS) or to just floatin' around in the blood stream.. He also said the steroid remained active in the blood for a duration of 12 hours or so, which explains the window given for applications.. I'll get with him to make sure, don't quote me on this until I double-check with him..