How long does it realistically take to write and publish 3 books?

I need to publish 3 books at the same time, 2 so I can copyright my pen name, which you can only do if your book is part of a series, and 1 so I can offer books to both genders, because if my book is only relevant to one gender, it will be a lot harder to universally promote on social media platforms. I just feel scared that writing 3 books at once could mean my career is delayed for a really long time.

How long does it realistically take to write and publish 3 books?
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