High dose: Your friend has a high tolerance to valium if s/he took that much and was still awake. Valium itself has a half-life of 30-60 hours, but some of its metabolites have half-lives up to 100 hours. This could remain detectable in urine for 5 x 100 hours, or 20-21 days (3 weeks).
Answered 4/30/2016
5.2k views
UDS: Valium can be detected with a urine drug screen for up to one to six weeks.
Answered 11/23/2018
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