Correct

片长

/ piān cháng / 
Strokes

Definition

length (duration) of a film

Example

As a Noun

length of a motion picture (in terms of showing time)

1
Gāi
该
yǐngpiàn
影片
piāncháng
片长
liǎng
两
xiǎoshí
小时
  
。

The length of the film is two hours.