Kung fu in a short time is to show skills. For example, Xiao Ming repaired the bench in a short time. Kung fu here can refer to Xiaoming's high skill in repairing benches.
And a moment's time means time, for example, wait for me for a while, I'll come right away.
Kung fu and its interpretation
Kung fu is a polysemous word, which refers to time and energy; Second, it refers to the manpower spent on doing things; The third refers to the ability to be competent after training; Four fingers work; Five fingers are meticulous, subtle and exquisite; Six refers to people who engaged in manual labor in ancient times. From Bao Pu Zi Yuan Lan by Ge Hong in Jin Dynasty: "Art and literature are not expensive, but time-consuming."
Kung fu refers to martial arts; Two-finger skills; Achievement; The time and energy spent by three fingers. From the ancient and modern novel Teng Yinda's broken furniture: "If you only check some household items every day, you will have time to say hello to your father's room."