how long does a klonopin stay in your system
6. Get help from a doctor now âº. A few days: Klonopin has a half life of 30-40 hours, so your body will eliminate half of the drug in about 2 days. It can take 5-7 half lives for a drug to be completely our of your system. The drug might still be detectable in your urine for up to 5 days.