I went cold turkey off of 2.5mg Klonopin about 4 years ago. Long story, won't repeat it (because I don't know if I'm allowed to here) but the short version is that it took 6 weeks for me to feel completely normal again. It wasn't an experience I'd like to repeat. I will say that I do take Klonopin now--a very low dose and only once in a great while. It took my pdoc a while to put me back on it (I think mainly because of the circumstances surrounding the issue, not because of the withdrawal) but we had a mutual agreement that I wouldn't go above this low dose and I would only take it once a day at the very most.