Setting a custom excerpt length in WordPress
Setting a custom excerpt length in WordPress is possible. With just these three lines of code inserted in your functions.php you can determine the desired length for your excerpts.
The snippet is basically a filter that checks the returned excerpts. And makes sure that they contain at least 30 words each.
Again you can modify this snippet as you want to fit your specific desired excerpt length. As you can see, in our case, it is set to 30 words.