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Present Perfect?

Present Perfect?

Hello,

I was hoping someone could help me with an English problem regarding present perfect sentences. I have a text that states: "We use the Present Perfect to say that an action happened at an unspecified time before now. The exact time is not important. You CANNOT use the Present Perfect with specific time expressions such as: yesterday, one year ago, last week, when I was a child, when I lived in Japan, at that moment, that day, one day, etc. We CAN use the Present Perfect with unspecific expressions such as: ever, never, once, many times, several times, before, so far, already, yet, etc. "

So, I have a sentence on my website that says: "Mr. Simpson has been practicing law in Arizona for over 20 years." Does the "over 20 years" violate the rule for not using specific time expressions? Feedback would be greatly appreciated.