How to Limit Excerpt Length in WordPress
There are many methods to Limit Excerpt Length in WordPress, You can limit the character length of your excerpt or limit the word length as per your desire. You can achieve it by adding a piece of code (excerpt length filter) in your functions.php file. And if you are planning to do so, I always recommend to use a child theme to edit core theme files i.e. functions.php
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Excerpt Length Filter (excerpt_length) Reference to Limit Excerpt Length in WordPress
By default excerpt length is set to 55 words in WordPress. Use this excerpt length filter to change excerpt length to 35 words. Add the code in functions.php file of your theme.