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Cocain can stay in your hair up to about 90 days. But there are also information that cocaine can stay in your hair for about 25 years after you only take it once
I'll throw some info in on this too though...
It's really going to come down to how they test the urine sample. If you are lucky, they will send the urine off to a NIDA standard laboratory. Which as already stated, they usually test for the metabolite benzoylecgonine - which can stick around for awhile.
However, according to NIDA standards, most people have a low enough level after about 8 days or so that the result will be considered a negative. So technically, even though it may be detected... it falls below the threshold for consideration as a 'positive'.
Different people, different usages, different lengths of time-frame for a positive. You may get lucky.
If they do an assay (dip) type test, they are usually much more sensitive to returning a positive due to no standard minimal level.
A lot of court-ordered drug testing though is aware of the use of flushing/detox products being sold that supposedly help you pass a urinalysis - and so some test for their presence as well under certain circumstances.