Doubling the string size does not change the reported memory use:
In [64]: d=pd.DataFrame(["%06d" %x for x in range(1000000)])
...: d.info()
<class 'pandas.core.frame.DataFrame'>
Int64Index: 1000000 entries, 0 to 999999
Data columns (total 1 columns):
0 1000000 non-null object
dtypes: object(1)
memory usage: 15.3 MB
In [65]: d=pd.DataFrame(["%012d" %x for x in range(1000000)])
...: d.info()
<class 'pandas.core.frame.DataFrame'>
Int64Index: 1000000 entries, 0 to 999999
Data columns (total 1 columns):
0 1000000 non-null object
dtypes: object(1)
memory usage: 15.3 MB
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