China players train consistently 8hrs/day for ages, perhaps the moment a player joins the badminton academy. Some other countries only do it for 2-3 years or only do so when the tournaments are near. How can every nation that implement 8hrs or more can produce WC consistently like China? It's surely not as simple as that. If you think 7hrs for Malaysian players are the best of the best, you win. Argument ends here. Only the coaches and players know what are the best. Anything that they do beyond the 7hrs is an extra bonus.