Valium, also known as diazepam, is a benzodiazepine commonly prescribed to treat anxiety, restless leg syndrome, insomnia, seizures, muscle spasms, and alcohol withdrawal syndrome.

It can also be used to calm and sedate people prior to surgery or other invasive medical procedures.

This drug is a very effective medication and considered important to medical establishments in general. However, benzodiazepines can be abused, and they can be addictive, eventually leading to serious health problems if taken for a long enough period of time.

Valium has long elimination half-life duration of 30-56 hours, or 43 hours on average. Per the 5.5 half-life thumb rule, it can be concluded that the drug will be in your system for fairly long, almost 10 days.

The active metabolite of Valium, nordiazepam, has an average elimination half-life of 70 ± 30 hours, meaning that it will be excreted from the system after about 16 days from the last dose.

Therefore, roughly after about 16 days since the final dose of Valium has been taken, it will be completely eliminated from your system.

Please note that these numbers, as mentioned, are averages. Individual factors like the age, body mass, liver and kidney conditions, and metabolic rate must be considered to understand how long valium will be in the system.

Other factors like the method of administration, whether other drugs are co-ingested that may influence the elimination process, the frequency of valium usage, and for how long the drug has been taken also play important roles in deciding the duration of valium elimination.