Custom excerpt legnths for specific pages

The excerpt length is the number of words, not the characters. Assuming that every word is 8 characters long in average, you might want to use this:

function wpdocs_custom_excerpt_length( $length ) {
    if( is_front_page() ){
        return 50;
    } else {
        return 100;
    }
}
add_filter( 'excerpt_length', 'wpdocs_custom_excerpt_length', 999 );

Source : WordPress codex

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