Are you talking about title meta tags or the header of your page?
If you're referring to the title meta tags, there's no reason to have the same keyword more than once, unless you really think people will be searching for a term with the same word more than once. Put as many different keywords as you can in your meta tags.
If you're referring to your page headers, then they will fall into the same rule as the rest of the content of your page. The general rule of thumb is 6% of content. So 6 times per 100 words.
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