[Python] How do I Convert data type in Python? [closed]

I have written this code:

df.loc[df['Profile Name'] == 'karladdo201', 'Duration'].astype('timedelta64').sum()


and get this value:

Timedelta('8 days 12:02:45')


How do I get a values similar or in this format ?: 4138000.0

from writing this code:

viewTime = {}
viewTime.update({"karladdo201": df.loc[df['Profile Name']=='karladdo201','Duration'].astype('timedelta64').sum()})
viewTime


They all come from a dataframe of my Netflix viewing history. I am using jupyter lab

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