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function the_excerpt_max_charlength( $charlength ){
	$excerpt = get_the_excerpt();
	$charlength++;

	if ( mb_strlen( $excerpt ) > $charlength ) {
		$subex = mb_substr( $excerpt, 0, $charlength - 5 );
		$exwords = explode( ' ', $subex );
		$excut = - ( mb_strlen( $exwords[ count( $exwords ) - 1 ] ) );
		if ( $excut < 0 ) {
			echo mb_substr( $subex, 0, $excut );
		} else {
			echo $subex;
		}
		echo '...';
	} else {
		echo $excerpt;
	}
}

the_excerpt_max_charlength(50)ж