ˊㄋㄧㄢˊㄕㄨˋㄇㄨˋshínián‑shùmùㄅㄞˇㄋㄧㄢˊㄕㄨˋㄖㄣˊbǎinián‑shùrén

十年树木,百年树人
  1. 培植需要培育人才需要百年比喻栽培人才長久形容培養人才不容

It takes ten years to nurture a tree, but a hundred years to train a man (idiom)​. A good education program takes a long time to develop.