On the menu with the most dishes, how many dishes were there on its second page?
menu with the most dishes refers to menu.id with MAX(dish_count); second page refers to page_number = 2;
SELECT COUNT(T1.dish_id) FROM MenuItem AS T1 INNER JOIN MenuPage AS T2 ON T1.menu_page_id = T2.id INNER JOIN Menu AS T3 ON T2.menu_id = T3.id WHERE T2.page_number = 2 GROUP BY T3.name ORDER BY T3.dish_count DESC LIMIT 1