A complete first draft can be completed in six months without throwing one’s life into turmoil.
Using one week to plan your plot, establish your six balanced characters and creating scene cards that have constant contained conflict, then writing two pages a day or at least 500 new words, it is entirely possible to create a first draft from beginning to end.
Take a look at this form and see how to create plot plan.
A first draft is not ready to send out to anyone. The book still needs a review of the original plan, at least two revisions and careful examination of word use (eliminating passive verbs, redundant information and wrong word used)
The 3by3 writing method also strongly suggests either hiring a technical editor, or getting a experienced editor (perhaps a college professor) to do it as a favor. A writer can not proof their own work.