Display all testimonials on a single page

Each testimonial is stored as a custom post type entry and can be used various ways.

To see the list of testimonials visit:

http://YOUR_URL/testimonial/

You can override the number of listings that are displayed using a function in you theme.

// Post Limit Testimonial
function rec_testimonial_post_limit( $query ) {
    if( !is_admin() && $query->is_main_query() && is_post_type_archive( 'testimonial' ) ) {
        $query->set( 'posts_per_page', '30' );
    }
}
add_action( 'pre_get_posts', 'rec_testimonial_post_limit' );

Adjust the 30 to the number you need on a page.