Perhaps you mean Diazepam? According to wikipedia it has a biological half-life of 20-100 hours (36-200 hours for main active metabolitedesmethyldiazepam).
http://en.wikipedia.org/wiki/Diazepam
how long does 25mg off valium last in your urine
one to six weeks
Anywhere from 72hrs to 3 weeks depending on the amount you've taken.
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