How long does Valium stay in system?

Well it usually takes any where from 15 to 21 days to be completely out of your system. If u take it on a daily basis of course but it u have just taken 1 of them to help you go t sleep and do not use them on a regular basis then it shouldn't take very long at all. Maybe 4-7 days and that is pushing it. Good luck hope u pass you drug test. Best decision if you are not prescribed them then do not take them any way buy only u can make that decision Good Luck.