Insert below code in your function.php to manually limit post excerpts

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

Insert below code in your function.php to have Continue Reading (or Read More)…

//* Modify the Genesis content limit read more link
add_filter( 'get_the_content_more_link', 'sp_read_more_link' );
function sp_read_more_link() {
    return '... <a class="more-link" href="' . get_permalink() . '">Continue Reading →</a>';
}