Typing a reference usually takes an average of 15 minutes as you construct your story from head to keyboard.
Silence is your best friend. You need as little distraction as possible.
You acquire a taste for cold coffee.
You need a bit of time to ‘settle in’ when you start. It’s a transition from reality to your book.
No matter how good you type, typo’s will be rife. Get a proof team.
Proof reading isn’t the same as play testing, although some people can be both. You need at least 4 including yourself.
You can take shortcuts and liberties and still produce something decent.