The default excerpt length is 55 words but you can control the number of words by doing the following:

1. Go to functions.php and paste the following code:

/* ********************
* Limit post excerpts. Within theme files used as
* print string_limit_words(get_the_excerpt(), 20);
******************************************************************** */
function string_limit_words($string, $word_limit) {
$words = explode(' ', $string, ($word_limit + 1));
if(count($words) > $word_limit)
array_pop($words);
return implode(' ', $words);
}

2. On the page where you want to show excerpt, paste the following:

<?php echo limit_words(get_the_excerpt(), '41'); ?>
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