First of all, never use query_posts, use WP_Query instead.
To show 50 carachters of each one of the pages:
<?php
$args = array(
'post_type' => 'page',
'post_parent' => '6',
'order'=> 'DESC'
);
$pages_returned = new WP_Query($args);
while ( $pages_returned->have_posts()): $pages_returned->the_post(); ?>
<div class="page-excerpt">
<h1><?php the_title(); ?></h1>
<?php the_excerpt(); ?>
</div>
<?php endwhile; ?>
Now for your 50 chars limit, on your functions.php add
function custom_excerpt_length( $length ) {
return 50;
}
add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );
That should be it.
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