" I think there really is no other way to write a long, serious
novel. You work, shelve it for a while, work, shelve it again,
work some more, month after month, year after year, and then
one day you read the whole piece through and, so far as you
can see, there are no mistakes. (The minute it's published and
you read the printed book you see a thousand.) This tortuous
process is not necessary, I suspect, for the writing of a popular
novel in which the characters are not meant to have depth and complexity, where character A is consistently stingy and character
B is consistently openhearted and nobody is a mass of
contradictions, as are real human beings. But for a true novel
there is generally no substitute for slow, slow baking.
We've all heard the stories of Tolstoy's pains over Anna Karenina,
Jane Austen's over Emma, or even Dostoevsky's over Crime and Punishment, a novel he grieved at having to publish prematurely,though he had worked at it much longer than most popular-fiction writers work at their novels. "

― John Gardner , On Becoming a Novelist