WooCommerce empty carts after 12 hour.

function empty_cart_after_12_hours() {
    if (is_admin()) return;
    
    $current_time = current_time('timestamp');
    $cart_time = WC()->session->get( 'cart_time' );
    
    if (empty($cart_time)) {
        WC()->session->set( 'cart_time', $current_time );
        return;
    }
    
    $cart_age_seconds = $current_time - $cart_time;
    $cart_expires_seconds = 12 * HOUR_IN_SECONDS;
    
    if ($cart_age_seconds >= $cart_expires_seconds) {
        WC()->cart->empty_cart();
    }
}
add_action( 'template_redirect', 'empty_cart_after_12_hours', 1 );