Find previous time gap and next time gap between non nan values

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I have a data frame like:

A    B   datetime
10  NaN  12-03-2020  04:43:11
NaN 20   13-03-2020  04:43:11
NaN NaN  14-03-2020  04:43:11
NaN NaN  15-03-2020  04:43:1


                      
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