I have a website in which I need to control the displayed excerpt length.
Some of the posts might have manual excerpt so I can’t use the excerpt_length filter.

I can, of course, use some kind of substr(), but was looking for a more elegant solution (if such exists).

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Take a look on my answer here: Best Collection of Code for your functions.php file

If I understood your question correctly, it does what you are looking for.

Place this in functions.php:

function excerpt($num) {
    $limit = $num+1;
    $excerpt = explode(' ', get_the_excerpt(), $limit);
    array_pop($excerpt);
    $excerpt = implode(" ",$excerpt)."... (<a href="" .get_permalink($post->ID) ." ">Read more</a>)";
    echo $excerpt;
}

Then, in your theme, use the code <?php excerpt('22'); ?> to limit the excerpt to 22 characters.

🙂

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