Becky Zagor
Becky Zagor asked Andy Weir:

Tell me about the idea behind the book which started you writing and how long it took you to write the first draft?

Andy Weir See this question for where the idea came from: https://www.goodreads.com/questions/2...

It didn't really have a "first draft". I released it as a serial, so I would do multiple editing passes on each chapter before posting them. It took a total of three years to complete. Then another month or so of editing once Random House picked it up for print publishing.
Andy Weir
61,353 followers

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