“Title tags are an important on-page factor for SEO. Aim to make your title tag more descriptive but containing fewer than 70 characters. This is the limit Google displays in search results.”
The 70 character limit is no longer true, Google changed how many it will show to one full line which could be over 100 characters (depends on the letters used a W is fatter than a 1).
There isn’t a perfect length, use as little or as many characters as is needed whilst trying to keep it short enough to fit on one line so Google doesn’t truncate it or if it does truncate, it still looks good.
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