'How to convert duration strings to seconds?

I have such a column in a pandas dataframe:

duration
1 day 22:12:15.778543
2 days 10:09:07.118723
00:18:23.985112

I would like to convert this duration to seconds.

How can I do this? I am not sure if this is possible because of the special string format I got (1 day, 2 days etc.)?

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