tái​shàng​yī​fēn​zhōng​tái​xià​shí​nián​gōng

ten years of practice for one minute on the stage

台上一分钟,台下十年功 臺上一分鐘,臺下十年功 tái​shàng​yī​fēn​zhōng​tái​xià​shí​nián​gōng
ten years of practice for one minute on the stage
(idiom) a short period of brilliance on stage requires many years of hard work behind the scenes