Correct

足足

/ zúzú / 
Strokes

Definition

fully/no less than/as much as/extremely

Example

As an Adverb

fully; as much as

1
Zhuāng
装
le
了
zúzú
足足
yī
一
chē
车
  
。

The car was loaded to its full capacity.

2
Zúzú
足足
50
50
nián
年

fully/entire fifty years