This question has also been asked and answered here: How long does Klonopin stay in your system?
Klonopin's half-life is 18-50 hours. A drug leaves your system after 5 half-lives, thus, Klonopin should be out of your system in 2-3 days. However, half-life is affected by dose, as well, and 2mg is not a huge dose but it's a moderate one. It could take as long as 4 days to completely leave your system. It all depends on your metabolism, genetic makeup, body weight, and height.
18-40 hrs half life
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