What is the shortest time that it takes to write a best selling book?

I thought the outline might take a few months to half a year while the actual writing might be something I can finish in 50 days. Assuming I write 14 pages a day and then edit for 25 days. I have an old outline that is already done which I can use if I don’t want to wait for this outline to finish itself before I complete a book.

I want to get my book finished as soon as possible because my lack of income is affecting my social life, I find people are losing respect for me and view me as a financial obligation.

What is the shortest time that it takes to write a best selling book?
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