Hey Michael,
This kind of code comes from your theme, so I’m really not sure the best way to go about it. We’re unfortunately unable to help with these types of customizations, but you can try adding the following snippet to your theme’s functions.php file and it will increase/decrease your excerpt length. Change the value (20) to whatever character limit fits your situation best.
function custom_excerpt_length( $length ) {
return 20;
}
add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );
Best of luck and sorry we can’t do more here. Cheers!