It depends on a few different things. Not everyone gets the same build. If you try to mass spread it, it won't take long. Or if someone else with the same build mass spreads it, it won't take long. It also may get detected by Kaspersky, for instance, but not by Norton. So it would depend upon what virus scanner is being used.
Also, when anyone tries to spread their malware at this site, I scan it at virustotal. If ther is one detection, even a suspicious file, that detection is shared with all the other vendors. After a week, thier malware is no good.
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