change this line:
$item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID) . $args->link_after;
to:
$item_output .= $args->link_before . apply_filters('the_title', substr($item->title, 0, 10), $item->ID) . $args->link_after;
That limits the character to 10. Please note this substr($item->title, 0, 10).
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