woocommerce_product_import_batch_size filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_product_import_batch_size', 'filter_function_name_6725' );
function filter_function_name_6725( $30 ){
	// filter...

	return $30;
}

$30

-

Where the hook is called

'lines'           => apply_filters( 'woocommerce_product_import_batch_size', 30 ),

Where in WP core the hook is used WooCommerce