How long is valium half-life

Aug 7, - I read on the net that diazepam has a halflife of hours which is days. I've only had mg so far, and that was on Sat allzone.eu long does diazepam last for and whats the best way to take it. If your liver function is impaired, it will take much longer to get Valium out of your system. Research shows that the half-life of Valium increased five times in those. Like well any truly within an hour? Its a real tease. The reason I ask is because of its long half life shouldn't those effects last longer? How Long Does Valium Stay In Your System For A Drug Test?