Excerpt Limit in a specific category archive in Genesis

TYPE 1

Default.

//* Modify the length of post excerpts
add_filter( 'excerpt_length', 'genesiskit_excerpt_length' );
function genesiskit_excerpt_length( $length ) {
	return 50; // pull first 50 words
}

TYPE 2

Target specific category

add_action( 'genesis_before_loop', 'genesiskit_change_excerpt_archives' );
	function genesiskit_change_excerpt_archives() {
	if ( ! is_category( 'uncategorized' ) ) { // enter your category slug here.
		return;
	}
	add_filter( 'excerpt_length', 'genesiskit_do_excerpt_limit' );
}
// Pull first 50 words.
function genesiskit_do_excerpt_limit() {
	return '50';
}

Multiple Categories

add_action( 'genesis_before_loop', 'genesiskit_change_excerpt_archives' );
	function genesiskit_change_excerpt_archives() {
	if ( ! is_category( 'uncategorized' ) && ! is_category( 'music' ) ) { // enter your category slug here.
		return;
	}
	add_filter( 'excerpt_length', 'genesiskit_do_excerpt_limit' );
}
// Pull first 50 words.
function genesiskit_do_excerpt_limit() {
	return '50';
}

TYPE 3

For Blog i.e Post page.

add_filter( 'excerpt_length', 'genesiskit_do_excerpt_limit_blog' );
// Set excerpt limit to 50 words.
function genesiskit_do_excerpt_limit_blog() {
	if ( ! is_home() || ! in_category( 'Uncategorized' ) ) {
		return;
	}
	return '50';
}