I agree that it varies by person and other factors.

I have been taking 0.5 mg Klonopin for about 9 years now. I don't know if it does anything. I take it at night, so that makes it even more difficult to figure out. I wish I was off of it completely, but my psychiatrist refuses to wean me off, for various reasons. One is likely not relevant to most people. For me, I always found Ativan to be a much more effective PRN. As for Ativan, it's also best for me when I don't take it that often or get to taking too much of it. Ativan works a little differently than Klonopin, though they are both benzos. There are fans of both. What I hated about Klonopin, initially, was that it made me tired during the day and that dragged on. Ativan has rarely made me that tired, so I prefer that during the daytime. It kicks in, for me, in about 20 to 30 mins. If I'm extremely anxious, I take 1 mg, but my mild anxiety is helped with as little as 0.5 mg. Sorry I'm answering for Ativan and not Klonopin. Again, Klonopin made me so tired that I was miserable.

As I've mastered coping skills, for some things my minimum needed doses decreased. When it comes to anxiety, trying to rely 100% on medications alone can be a losing battle.