Hurst Exponent in Rolling Basis

[illmattic]

I've tried using the function like this:

df.apply(lambda row: custom_hurst(df), axis=1)

Output:
1983-03-30    0.682463
1983-03-31    0.682463
1983-04-04    0.682463
1983-04-05    0.682463
1983-04-06    0.682463
  
2020-12-29    0.682463
2020-12-30    0.682463
2020-12-31    0.682463
2021-01-04    0.682463
2021-01-05    0.682463

but as you see, the function is inputting the same 365 rows of the df. How would I adjust the code so that it rolls with the dates instead of being static?