Correct

费工夫

/ fèigōngfu /
Strokes

Definition

to spend a great deal of time and effort/(of a task) demanding/exacting

Example

As a Verb

take time and energy; be time-consuming

1
Gàifáng
盖房
shì
是
jiàn
件
hěn
很
fèigōngfu
费工夫
de
的
shì
事
。

House-building is time-consuming.

2
Fèigōngfu
费工夫
de
的
huór
活儿

exacting job