Correct
十年树木，百年树人
/ shí nián shùmù, bǎinián shù rén /
Strokes
Definition
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.
Example
Definition
it takes ten years for a tree to grow to its full height, but a hundred for qualified personnel to mature―it takes long years to cultivate people