Good question. I actually don't know anything about the half life's of sarms I'd like to know myself. I doubt it's very long being an oral. But who knows...
First of all please don't confuse half life with detection time. Those are two very different things. The half life of active compound is 24 hours, but detection time is much much longer. I don't know exactly what it is, but I have heard that about 6 weeks is a pretty safe time to be off of it before a test. Who is testing you? Is this for an athletic organization?
(PM me for a price list for Biotech Labs and 10% discount)